improve ticklabelstandoff description and note that inside ticks could move outside and outside ticks could move inside

Author: my-tien

src/plots/cartesian/layout_attributes.js

@@ -712,10 +712,13 @@ module.exports = {
         dflt: 0,
         editType: 'ticks',
         description: [
-            'Shifts the tick labels by the specified number of pixels orthogonally to the axis.',
-            'A positive `ticklabelstandoff` will move the labels farther away from the plot area',
-            'if `ticklabelposition` is "outside", and deeper into the plotarea if',
-            '`ticklabelposition` is "inside".'
+            'Sets the standoff distance (in px) between the axis tick labels and their default position.',
+            'A positive `ticklabelstandoff` moves the labels farther away from the plot area',
+            'if `ticklabelposition` is *outside*, and deeper into the plot area if',
+            '`ticklabelposition` is *inside*. A negative `ticklabelstandoff` works in the opposite',
+            'direction, moving outside ticks towards the plot area and inside ticks towards',
+            'the outside. If the negative value is large enough, inside ticks can even end up',
+            'outside and vice versa.'
         ].join(' ')
     },
     mirror: {

test/plot-schema.json

@@ -15161,7 +15161,7 @@
      "valType": "integer"
     },
     "ticklabelstandoff": {
-     "description": "Shifts the tick labels by the specified number of pixels orthogonally to the axis. A positive `ticklabelstandoff` will move the labels farther away from the plot area if `ticklabelposition` is \"outside\", and deeper into the plotarea if `ticklabelposition` is \"inside\".",
+     "description": "Sets the standoff distance (in px) between the axis tick labels and their default position. A positive `ticklabelstandoff` moves the labels farther away from the plot area if `ticklabelposition` is *outside*, and deeper into the plot area if `ticklabelposition` is *inside*. A negative `ticklabelstandoff` works in the opposite direction, moving outside ticks towards the plot area and inside ticks towards the outside. If the negative value is large enough, inside ticks can even end up outside and vice versa.",
      "dflt": 0,
      "editType": "ticks",
      "valType": "integer"
@@ -16482,7 +16482,7 @@
      "valType": "integer"
     },
     "ticklabelstandoff": {
-     "description": "Shifts the tick labels by the specified number of pixels orthogonally to the axis. A positive `ticklabelstandoff` will move the labels farther away from the plot area if `ticklabelposition` is \"outside\", and deeper into the plotarea if `ticklabelposition` is \"inside\".",
+     "description": "Sets the standoff distance (in px) between the axis tick labels and their default position. A positive `ticklabelstandoff` moves the labels farther away from the plot area if `ticklabelposition` is *outside*, and deeper into the plot area if `ticklabelposition` is *inside*. A negative `ticklabelstandoff` works in the opposite direction, moving outside ticks towards the plot area and inside ticks towards the outside. If the negative value is large enough, inside ticks can even end up outside and vice versa.",
      "dflt": 0,
      "editType": "ticks",
      "valType": "integer"