[FLINK-39405][docs] Fix document escape display errors on sql built-in function page (#27900)

Author: Au-Miner

docs/data/sql_functions.yml

@@ -50,9 +50,9 @@ comparison:
     description: By default (or with the ASYMMETRIC keyword), returns TRUE if value1 is less than value2 or greater than value3. With the SYMMETRIC keyword, returns TRUE if value1 is not inclusively between value2 and value3. When either value2 or value3 is NULL, returns TRUE or UNKNOWN. E.g., 12 NOT BETWEEN 15 AND 12 returns TRUE; 12 NOT BETWEEN SYMMETRIC 15 AND 12 returns FALSE; 12 NOT BETWEEN NULL AND 15 returns UNKNOWN; 12 NOT BETWEEN 15 AND NULL returns TRUE; 12 NOT BETWEEN SYMMETRIC 12 AND NULL returns UNKNOWN.
   - sql: string1 LIKE string2 [ ESCAPE char ]
     table: string1.like(string2[, char])
-    description: Returns TRUE if string1 matches pattern string2; returns UNKNOWN if string1 or string2 is NULL. An escape character consisting of a single char can be defined if necessary, '\' by default.
+    description: Returns TRUE if string1 matches pattern string2; returns UNKNOWN if string1 or string2 is NULL. An escape character consisting of a single char can be defined if necessary, `\` by default.
   - sql: string1 NOT LIKE string2 [ ESCAPE char ]
-    description: Returns TRUE if string1 does not match pattern string2; returns UNKNOWN if string1 or string2 is NULL. An escape character consisting of a single char can be defined if necessary, '\' by default.
+    description: Returns TRUE if string1 does not match pattern string2; returns UNKNOWN if string1 or string2 is NULL. An escape character consisting of a single char can be defined if necessary, `\` by default.
   - sql: string1 SIMILAR TO string2 [ ESCAPE char ]
     table: string1.similar(string2)
     description: Returns TRUE if string1 matches SQL regular expression string2; returns UNKNOWN if string1 or string2 is NULL. An escape character can be defined if necessary. The escape character has not been supported yet.
@@ -522,10 +522,10 @@ string:
     description: Returns a substring of string starting from position integer1 with length integer2 (to the end by default).
   - sql: JSON_QUOTE(string)
     table: STRING.JsonQuote()
-    description: Quotes a string as a JSON value by wrapping it with double quote characters, escaping interior quote and special characters ('"', '\', '/', 'b', 'f', 'n', 'r', 't'), and returning the result as a string. If the argument is NULL, the function returns NULL.
+    description: Quotes a string as a JSON value by wrapping it with double quote characters, escaping interior quote and special characters (`"`, `\`, `/`, `\b`, `\f`, `\n`, `\r`, `\t`), and returning the result as a string. If the argument is NULL, the function returns NULL.
   - sql: JSON_UNQUOTE(string)
     table: STRING.JsonUnquote()
-    description: Unquotes JSON value, unescapes escaped special characters ('"', '\', '/', 'b', 'f', 'n', 'r', 't', 'u' hex hex hex hex), and returns the result as a string. If the argument is NULL, returns NULL. If the value does not start and end with double quotes or if it starts and ends with double quotes but is not a valid JSON string literal, the value is passed through unmodified.
+    description: Unquotes JSON value, unescapes escaped special characters (`"`, `\`, `/`, `\b`, `\f`, `\n`, `\r`, `\t`, `\u` hex hex hex hex), and returns the result as a string. If the argument is NULL, returns NULL. If the value does not start and end with double quotes or if it starts and ends with double quotes but is not a valid JSON string literal, the value is passed through unmodified.
   - sql: ELT(index, expr[, exprs]*)
     table: index.elt(expr, exprs...)
     description: |

docs/data/sql_functions_zh.yml

@@ -72,11 +72,11 @@ comparison:
     table: string1.like(string2[, char])
     description: |
       如果 string1 匹配 string2 返回 `TRUE`；如果 string1 或 string2 为 `NULL` 返回 `UNKNOWN`。
-      如果需要可以定义包含单个字符的转义字符，默认为 '\'。
+      如果需要可以定义包含单个字符的转义字符，默认为 `\`。
   - sql: string1 NOT LIKE string2 [ ESCAPE char ]
     description: |
       如果 string1 与 string2 不匹配返回 `TRUE`；如果 string1 或 string2 为 `NULL` 返回 `UNKNOWN`。
-      如果需要可以定义包含单个字符的转义字符，默认为 '\'。
+      如果需要可以定义包含单个字符的转义字符，默认为 `\`。
   - sql: string1 SIMILAR TO string2 [ ESCAPE char ]
     table: string1.similar(string2)
     description: |
@@ -619,10 +619,10 @@ string:
     description: 返回字符串的子字符串，从位置 integer1 开始，长度为 integer2（默认到末尾）。
   - sql: JSON_QUOTE(string)
     table: STRING.JsonQuote()
-    description: Quotes a string as a JSON value by wrapping it with double quote characters, escaping interior quote and special characters ('"', '\', '/', 'b', 'f', 'n', 'r', 't'), and returning the result as a string. If the argument is NULL, the function returns NULL.
+    description: Quotes a string as a JSON value by wrapping it with double quote characters, escaping interior quote and special characters (`"`, `\`, `/`, `\b`, `\f`, `\n`, `\r`, `\t`), and returning the result as a string. If the argument is NULL, the function returns NULL.
   - sql: JSON_UNQUOTE(string)
     table: STRING.JsonUnquote()
-    description: Unquotes JSON value, unescapes escaped special characters ('"', '\', '/', 'b', 'f', 'n', 'r', 't', 'u' hex hex hex hex), and returns the result as a string. If the argument is NULL, returns NULL. If the value does not start and end with double quotes or if it starts and ends with double quotes but is not a valid JSON string literal, the value is passed through unmodified.
+    description: Unquotes JSON value, unescapes escaped special characters (`"`, `\`, `/`, `\b`, `\f`, `\n`, `\r`, `\t`, `\u` hex hex hex hex), and returns the result as a string. If the argument is NULL, returns NULL. If the value does not start and end with double quotes or if it starts and ends with double quotes but is not a valid JSON string literal, the value is passed through unmodified.
   - sql: ELT(index, expr[, exprs]*)
     table: index.elt(expr, exprs...)
     description: |