fixed syntax errors

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@25379 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/hashmap.tex

@@ -3,7 +3,7 @@
 This is a simple, type-safe, and reasonably efficient hash map class,
 whose interface is a subset of the interface of STL containers. In
 particular, the interface is modelled after std::map, and the various,
-non standard, std::hash_map.
+non standard, std::hash\_map.
 
 \wxheading{Example}