man: small tweaks

Author: djcb

man/exit-code.inc

@@ -5,11 +5,11 @@
 This command returns 0 upon successful completion, or a non-zero exit code
 otherwise.
 
-    0. success
-    2. no matches found. Try a different query
-   11. database schema mismatch. You need to re-initialize *mu*, see {{{man-link(mu-init,1)}}}
-   19. failed to acquire lock. Some other program has exclusive access to the *mu* database
-   99. caught an exception
+    0. Success
+    2. No matches found. Try a different query
+   11. Database schema mismatch: re-initialize *mu*, see {{{man-link(mu-init,1)}}}
+   19. Failed to acquire lock. Some other program has exclusive access to the *mu* database
+   99. Caught an exception
 
 # Local Variables:
 # mode: org

man/mu-labels.1.org

@@ -121,7 +121,7 @@ See *EXPORT FORMAT* below for details on the format.
 restrictions on what is accepted as a label.
 
 - a *valid label character* is any character that is not a control-character, not
-  a blank, nor anything matching the regular expression ~[\"$',/\\`]~
+  a blank, nor anything matching =["$',/\`]=
 - a *valid label* consists of one or more valid label characters, the first of
   which must *not* be either *+* or *-*