Fix premature truncation of brief descriptions in Doxygen comments.

Don't end the brief description at the first period if it's a period which is
part of "i.e." or "e.g.": escape the space following it to prevent Doxygen
from recognizing it as an end of sentence.

See #14866.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73084 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/pickerbase.h

@@ -106,7 +106,7 @@ public:
     int GetTextCtrlProportion() const;
 
     /**
-        Returns @true if this window has a valid text control (i.e. if the @c
+        Returns @true if this window has a valid text control (i.e.\ if the @c
         wxPB_USE_TEXTCTRL style was given when creating this control).
     */
     bool HasTextCtrl() const;