A follow-up to r27646, tweaking an error message and formatting.
A follow-up to r27646, tweaking an error message and formatting.

* subversion/libsvn_ra_serf/serf.c
  (svn_ra_serf__has_capability): Make error message sentence case.
  (capabilities_headers_iterator_callback): Consistify vertical spacing.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion