Fix typo in wxStandardPathsBase::ResourceCat description and document it.

Document the enum itself and also correct GetLocalizedResourcesDir()
documentation which didn't specify the default value for the category
parameter.

Closes #12523.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65652 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/stdpaths.h

@@ -28,7 +28,7 @@ class WXDLLIMPEXP_FWD_BASE wxStandardPaths;
 class WXDLLIMPEXP_BASE wxStandardPathsBase
 {
 public:
-    // possible resources categorires
+    // possible resources categories
     enum ResourceCat
     {
         // no special category

interface/wx/stdpaths.h

@@ -54,6 +54,17 @@
 class wxStandardPaths
 {
 public:
+    /// Possible values for category parameter of GetLocalizedResourcesDir().
+    enum ResourceCat
+    {
+        /// No special category, this is the default.
+        ResourceCat_None,
+
+        /// Message catalog resources category.
+        ResourceCat_Messages
+    };
+
+
     /**
         MSW-specific function undoing the effect of IgnoreAppSubDir() calls.
 
@@ -174,8 +185,9 @@ public:
 
         @since 2.7.0
     */
-    virtual wxString GetLocalizedResourcesDir(const wxString& lang,
-                                              ResourceCat category) const;
+    virtual wxString
+    GetLocalizedResourcesDir(const wxString& lang,
+                             ResourceCat category = ResourceCat_None) const;
 
     /**
         Return the directory where the loadable modules (plugins) live.