Use the \note and \warning macros where appropriate.
diff --git a/Doc/lib/libre.tex b/Doc/lib/libre.tex
index 7ee1efd..1fba741 100644
--- a/Doc/lib/libre.tex
+++ b/Doc/lib/libre.tex
@@ -482,8 +482,8 @@
   match the pattern; note that this is different from a zero-length
   match.
 
-  \strong{Note:}  If you want to locate a match anywhere in
-  \var{string}, use \method{search()} instead.
+  \note{If you want to locate a match anywhere in
+  \var{string}, use \method{search()} instead.}
 \end{funcdesc}
 
 \begin{funcdesc}{split}{pattern, string\optional{, maxsplit\code{ = 0}}}
@@ -618,8 +618,8 @@
   match the pattern; note that this is different from a zero-length
   match.
 
-  \strong{Note:}  If you want to locate a match anywhere in
-  \var{string}, use \method{search()} instead.
+  \note{If you want to locate a match anywhere in
+  \var{string}, use \method{search()} instead.}
 
   The optional second parameter \var{pos} gives an index in the string
   where the search is to start; it defaults to \code{0}.  This is not