docs: added missing maximum size limitation on static street view api (googlemaps#438)

* Updated static street view size

* Reverted 8937106

* fix: added missing size limitation information

Author: nora-soderlund

specification/parameters/streetview/size.yml

@@ -14,7 +14,7 @@
 
 name: size
 description: |
-  Specifies the output size of the image in pixels. Size is specified as `{width}x{height}` - for example, `size=600x400` returns an image 600 pixels wide, and 400 high.
+  Specifies the output size of the image in pixels. Must not exceed 640 pixels wide or high, anything over will default to 640 pixels. Size is specified as `{width}x{height}` - for example, `size=600x400` returns an image 600 pixels wide, and 400 high.
 schema:
   type: string
 in: query