fix(docs): Fix return type for ST_CoordDim (#26355)

## Description
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Change the docs return type to ST_CoordDim

## Motivation and Context
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Match the docs with the java code for ST_CoorDim return type to be
tinyint:
https://github.com/prestodb/presto/blob/1a4b46238ae4e59294842eb0e51cca4ee9589842/presto-main-base/src/main/java/com/facebook/presto/geospatial/GeoFunctions.java#L340
related to: #26344


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performance impact-->

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Author: jkhaliqi

presto-docs/src/main/sphinx/functions/geospatial.rst

@@ -268,7 +268,7 @@ Accessors
 
     Returns the minimum convex geometry that encloses all input geometries.
 
-.. function:: ST_CoordDim(Geometry) -> bigint
+.. function:: ST_CoordDim(Geometry) -> tinyint
 
     Return the coordinate dimension of the geometry.