Clarify meaning of 'tracker directory' in upgrading doc.

now shown as 'tracker home directory' and link to 'tracker home' in
glossary added. Also expand on how to identify the tracker home in the
glossary term.

Prompted by question on irc at: 2023-06-21 09:38:37

Author: rouilj

doc/glossary.txt

@@ -60,7 +60,8 @@ Roundup Glossary
       the schema and hyperdb that forms one issue tracker
 
    tracker home
-      the physical location on disk of a tracker
+      the physical location on disk of a tracker. It has the
+      ``config.ini``, ``schema.py`` files for the tracker.
 
 
 -----------------

doc/upgrading-history.txt

@@ -182,8 +182,8 @@ own queries (or public queries). This is implemented with a `check`
 method, therefore the default search permissions will not allow
 searching and you'll have to add an explicit search permission.
 If you have modified your schema, you can check if you're missing any
-search permissions with the following script, run it in your tracker
-directory, it will list for each Class and Property the roles that may
+search permissions with the following script, run it in your :term:`tracker
+home` directory, it will list for each Class and Property the roles that may
 search for this property::
 
     #!/usr/bin/python