Fix up some doxygen issues.

(closes issue #11996)
Patches:
      bug_11996_doxygen.diff uploaded by snuffy (license 35)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@103723 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/extconf.h

@@ -15,8 +15,9 @@
  * the GNU General Public License Version 2. See the LICENSE file
  * at the top of the source tree.
  */
-/*! \file External configuration handlers (realtime and static configuration)
- *  \author Steve Murphy <murf@digium.com>
+/*! \file 
+ * \brief External configuration handlers (realtime and static configuration)
+ * \author Steve Murphy <murf@digium.com>
  *
  */
 

include/asterisk/strings.h

@@ -148,16 +148,15 @@ char *ast_strip(char *s),
 char *ast_strip_quoted(char *s, const char *beg_quotes, const char *end_quotes);
 
 /*!
-  \brief Strip backslash for "escaped" semicolons.
-  \brief s The string to be stripped (will be modified).
+  \brief Strip backslash for "escaped" semicolons, 
+	the string to be stripped (will be modified).
   \return The stripped string.
  */
 char *ast_unescape_semicolon(char *s);
 
 /*!
-  \brief Convert some C escape sequences (\b\f\n\r\t) into the
-	equivalent characters.
-  \brief s The string to be converted (will be modified).
+  \brief Convert some C escape sequences  \verbatim (\b\f\n\r\t) \endverbatim into the
+	equivalent characters. The string to be converted (will be modified).
   \return The converted string.
  */
 char *ast_unescape_c(char *s);

include/asterisk/time.h

@@ -57,8 +57,9 @@ int ast_tvdiff_sec(struct timeval end, struct timeval start),
 
 /*!
  * \brief Computes the difference (in microseconds) between two \c struct \c timeval instances.
- * \param end the end of the time period
- * \param start the beginning of the time period
+ * \param ast_tvdiff_sec 
+ * \arg end the end of the time period
+ * \arg start the beginning of the time period
  * \return the difference in microseconds
  */
 AST_INLINE_API(