Update .gitignore

Update for universal-ctags#2209.

Author: k-takata

.gitignore

@@ -80,6 +80,9 @@ man/ctags-incompatibilities.7.rst
 man/ctags-optlib.7
 man/ctags-optlib.7.html
 man/ctags-optlib.7.rst
+man/tags.5
+man/tags.5.html
+man/tags.5.rst
 misc/mini-geany.actual
 Tmain/**/Makefile
 Tmain/**/Makefile.am