man: Fix rendering of certain sections in vtc(7)

The matching regular expression did not align with the substitution
regular expression.

Refs d2e526ce

doc/sphinx/vtc-syntax.py

@@ -38,7 +38,7 @@ import re
 def parse_file(fn, cl, tl, sl):
     p = False
     section = ""
-    resec = re.compile("\s*/\* SECTION: ")
+    resec = re.compile("\s*/?\* SECTION: ")
 
     try:
         # Python3