Document SelectOp class

This was missing from the commit that introduced SelectOp although the
documentation was present in the LangRef.md.

PiperOrigin-RevId: 223476888
1 file changed
tree: 3450d3a7cb92592d2216d3dca90ac6c1a827594b
  1. g3doc/
  2. include/
  3. lib/
  4. test/
  5. tools/
  6. utils/
  7. .clang-format
  8. LICENSE.TXT