chore: add more example values for expressions (#1376)

* Add example values to v8.json parameters

* Apply suggestion

---------

Co-authored-by: Harel M <[email protected]>

Author: CommanderStorm

src/reference/v8.json

@@ -2265,6 +2265,7 @@
           "zoom"
         ]
       },
+      "example": ["center", "left", "right"],
       "property-type": "data-constant"
     },
     "text-variable-anchor-offset": {
@@ -2297,6 +2298,7 @@
           "feature"
         ]
       },
+      "example": ["top", [0, 4], "left", [3, 0], "bottom", [1, 1]],
       "property-type": "data-driven"
     },
     "text-anchor": {