Consistency: "{\bf ...}" ==> "\strong{...}"

"{\em ...}" ==> "\emph{...}"

	      Not at all sure what to do with "{\rm ...}".
	      Leaving it for now.

Doc/lib/libaudioop.tex

@@ -133,7 +133,7 @@ samples in the sound fragment.
 \end{funcdesc}
 
 \begin{funcdesc}{max}{fragment\, width}
-Return the maximum of the {\em absolute value} of all samples in a
+Return the maximum of the \emph{absolute value} of all samples in a
 fragment.
 \end{funcdesc}