doc/.gitignore: Remove SANE Standard related files and patterns

doc/.gitignore

@@ -2,24 +2,11 @@
 *.5
 *.7
 *.8
-*.eps
 *.html
-*.pdf
 descriptions-external.db
 descriptions.db
 doxygen-genesys.conf
 doxygen-sanei.conf
 doxygen_sqlite3.db
 genesys-html
-sane.aux
-sane.cb
-sane.dvi
-sane.idx
-sane.ilg
-sane.ind
-sane.lof
-sane.log
-sane.lot
-sane.ps
-sane.toc
 sanei-html