mu-man: improve typesetting of references

Try to stick to the man-pages(7) standard.

man/mu-bookmarks.5.org

@@ -1,5 +1,6 @@
 #+TITLE: MU BOOKMARKS
 #+MAN_CLASS_OPTIONS: :section-id "@SECTION_ID@" :date "@MAN_DATE@"
+#+include: macros.inc
 
 * NAME
 
@@ -13,7 +14,7 @@ name for often-used queries. The bookmarks are also visible as shortcuts in the
 
 The bookmarks file is read from =<muhome>/bookmarks=. On Unix this would typically
 be w be =~/.config/mu/bookmarks=, but this can be influenced using the *--muhome*
-parameter for *mu-find(1)*.
+parameter for {{{man-link(mu-find,1)}}}.
 
 The bookmarks file is a typical key=value *.ini*-file, which is best shown by
 means of an example:
@@ -25,7 +26,7 @@ oldhat=maildir:/archive subject:hat   # archived with subject containing 'hat'
 #+end_example
 
 The *[mu]* group header is required. For practical uses of bookmarks, see
-*mu-find(1)*.
+{{{man-link(mu-find,1)}}}.
 
 #+include: "author.inc" :minlevel 1
 
@@ -33,4 +34,5 @@ The *[mu]* group header is required. For practical uses of bookmarks, see
 
 * SEE ALSO
 
-*mu(1)*, *mu-find(1)*
+{{{man-link(mu,1)}}},
+{{{man-link(mu-find,1)}}}