documentation: ignore byproducts from latex

When using 'make pdfdocs', auto-generated files should be ignored
Signed-off-by: NHenrik Austad <henrik@austad.us>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Documentation/DocBook/.gitignore

@@ -4,3 +4,7 @@
 *.html
 *.9.gz
 *.9
+*.aux
+*.dvi
+*.log
+*.out