Add auto-doc support for @StringDef.

Behaves pretty much the same as @IntDef, but now supports "suffix"
in addition to "prefix" when matching constants.

Test: manual docs output looks sane
Bug: 70406696
Change-Id: I2bb0a12fc8a7ba1295a82daf0cf31ec69e4a9430
Merged-In: I2bb0a12fc8a7ba1295a82daf0cf31ec69e4a9430
2 files changed