Spring Fix typo in URI Encoding section of reference docs

VALUES_ONLY: Does not encode the URI template and, instead, applies strict encoding to URI variables through UriUtils#encodeUriUriVariables prior to expanding them into the template.

I fixed UriUtils#encodeUriUriVariables into UriUtils#encodeUriVariables in "1.5.3. URI Encoding" section of reference docs.

Comment From: sbrannen

Good catch.

This has been merged into master.

Thanks