[docmaker] Allow `-' in bold and italic markup.

* src/tools/docmaker/sources.py (re_italic, re_bold): Adjust
accordingly.

ChangeLog

@@ -1,3 +1,10 @@
+2015-09-10  Werner Lemberg  <wl@gnu.org>
+
+	[docmaker] Allow `-' in bold and italic markup.
+
+	* src/tools/docmaker/sources.py (re_italic, re_bold): Adjust
+	accordingly.
+
 2015-09-09  Alexei Podtelezhnikov  <apodtele@gmail.com>
 
 	* src/base/ftcalc.c (FT_RoundFix): Improve.

src/tools/docmaker/sources.py

@@ -150,10 +150,11 @@ re_crossref = re.compile( r'@((?:\w|-)*)(.*)' )    #  @foo
 # Group 1 is the markup, group 2 the rest of the line.
 #
 # Note that the markup is limited to words consisting of letters, digits,
-# the character `_', or an apostrophe (but not as the first character).
+# the characters `_' and `-', or an apostrophe (but not as the first
+# character).
 #
-re_italic = re.compile( r"_(\w(?:\w|')*)_(.*)" )     #  _italic_
-re_bold   = re.compile( r"\*(\w(?:\w|')*)\*(.*)" )   #  *bold*
+re_italic = re.compile( r"_((?:\w|-)(?:\w|'|-)*)_(.*)" )     #  _italic_
+re_bold   = re.compile( r"\*((?:\w|-)(?:\w|'|-)*)\*(.*)" )   #  *bold*
 
 #
 # This regular expression code to identify an URL has been taken from