Update link to Style Guide.
Update link to Style Guide.

Fixes #2526
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=127196987

typetools/guava,mosoft521/guava,tli2/guava,DavesMan/guava,rgoldberg/guava,rgoldberg/guava,typetools/guava,mosoft521/guava,EdwardLee03/guava,google/guava,Xaerxess/guava,google/guava,EdwardLee03/guava,google/guava,berndhopp/guava,DavesMan/guava,Xaerxess/guava,xasx/guava,mosoft521/guava,tli2/guava,berndhopp/guava,xasx/guava