Fix buffer.writeu16 int number range (#919)

## Changes
This pr fixes the integer number range for the value parameter in
buffer.writeu16. Which is currently written as [0, 65536], where it
should be [0, 65535]

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Author: bkmazefe

content/en-us/reference/engine/libraries/buffer.yaml

@@ -366,7 +366,7 @@ functions:
         type: number
         default:
         summary: |
-          An integer number in range [0, 65,536].
+          An integer number in range [0, 65,535].
     returns:
       - type: void
         summary: ''