Fixed more '_' issues

Fixed all places that \begin{verbatim} and \end{verbatim} were not on lines by themselves (which tex2rtf cannot handle).
Changed all \verb$....$ occurrances to \tt{....}


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10307 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/htmlhlpf.tex

@@ -39,7 +39,7 @@ with some error. See also
 \wxheading{Contents file (.hhc)}
 
 Contents file has HTML syntax and it can be parsed by regular HTML parser. It contains exactly one list
-(\verb$<ul>$....\verb$</ul>$ statement):
+(\tt{<ul>}....\tt{</ul>} statement):
 
 \begin{verbatim}
 <ul>
@@ -63,7 +63,7 @@ You can modify value attributes of param tags. {\it topic name} is name of chapt
 contents, {\it filename.htm} is HTML page name (relative to .hhp file) and {\it numeric\_id} is optional 
 - it is used only when you use \helpref{wxHtmlHelpController::Display(int)}{wxhtmlhelpcontrollerdisplay}
 
-Items in the list may be nested - one \verb$<li>$ statement may contain a \verb$<ul>$ sub-statement:
+Items in the list may be nested - one \tt{<li>} statement may contain a \tt{<ul>} sub-statement:
 
 \begin{verbatim}
 <ul>