[re.results] Add missing reference (#201)

Fixes #201.

Author: Dawn Perchik

source/regex.tex

@@ -2571,7 +2571,8 @@
 \indextext{\idxcode{match_results}!as sequence}%
 The class template \tcode{match_results} satisfies the requirements of an
 allocator-aware container and of a sequence container, as specified
-in~\ref{sequence.reqmts}, except that only operations defined for const-qualified
+in \ref{container.requirements.general} and \ref{sequence.reqmts} respectively,
+except that only operations defined for const-qualified
 sequence containers are supported.
 
 \pnum