man: use meaningful titles for <ulink>s

As pointed out in https://github.com/systemd/systemd/issues/29814, we need to
use phrases are are meaningful on their own, because the man page formatter
creates a list at the bottom. With <ulink>see docs</ulink>, we end up with:
  NOTES:
    1. see docs
       https://some.url/page
    2. see docs
       https://some.url/page2
which is not very useful :(

Also, the text inside the tag should not include punctuation.

Python helper:
  from xml_helper import xml_parse
  for p in glob.glob('../man/*.xml'):
       t = xml_parse(p)
       ulinks = t.iterfind('.//ulink')
       for ulink in ulinks:
           if ulink.text is None: continue
           text = ' '.join(ulink.text.split())
           print(f'{p}: {text}')

1 files changed, 2 insertions, 2 deletions

diff --git a/man/systemd-id128.xml b/man/systemd-id128.xml
index 32c5af9671..d9378b69df 100644
--- a/man/systemd-id128.xml
+++ b/man/systemd-id128.xml
@@ -137,8 +137,8 @@
         <term><option>--uuid</option></term>
 
         <listitem><para>Generate output as a UUID formatted in the "canonical representation", with five
-        groups of digits separated by hyphens. See the
-        <ulink url="https://en.wikipedia.org/wiki/Universally_unique_identifier#Format">wikipedia</ulink>
+        groups of digits separated by hyphens. See the Wikipedia entry for
+        <ulink url="https://en.wikipedia.org/wiki/Universally_unique_identifier#Format">Universally Unique Identifiers</ulink>
         for more discussion.</para>
 
         <xi:include href="version-info.xml" xpointer="v244"/></listitem>