Fix whitespace and remove obsolete gitattributes entry

.gitattributes

src/backend/tsearch/dicts/hunspell_sample.affix

src/backend/tsearch/dicts/hunspell_sample_long.affix

src/backend/tsearch/dicts/hunspell_sample_num.affix

src/backend/tsearch/spell.c

src/test/regress/sql/tstypes.sql