docs/online-help: prefix some refs with their chapter name

and fix some issues from referenced named the same as their heading
they anchor too.

This should be fixed for real in our python plugin to scan for such
references, its probably a bug there, but as most of the problematic
ones where wrong (missing chapter prefix) anyway changing them is OK
too.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

docs/backup-client.rst

@@ -86,7 +86,7 @@ Please use the following environment variables to modify output behavior:
    format if you need to process the output.
 
 
-.. _creating-backups:
+.. _client_creating_backups:
 
 Creating Backups
 ----------------
@@ -246,7 +246,7 @@ Restoring this backup will result in:
     .  ..  file2
 
 
-.. _encryption:
+.. _client_encryption:
 
 Encryption
 ----------
@@ -660,7 +660,7 @@ shows the list of existing snapshots and what actions prune would take.
    space you need to perform :ref:`garbage-collection`.
 
 
-.. _garbage-collection:
+.. _client_garbage-collection:
 
 Garbage Collection
 ------------------

docs/calendarevents.rst

@@ -1,5 +1,4 @@
-
-.. _calendar-events:
+.. _calendar-event-scheduling:
 
 Calendar Events
 ===============

docs/technical-overview.rst

@@ -1,8 +1,8 @@
+.. _tech_design_overview:
+
 Technical Overview
 ==================
 
-.. _technical_overview:
-
 Datastores
 ----------
 

docs/terminology.rst

@@ -1,4 +1,4 @@
-.. _terminology:
+.. _terms:
 
 Terminology
 ===========
@@ -101,7 +101,7 @@ Backup Group
 The tuple ``<type>/<ID>`` is called a backup group. Such a group
 may contain one or more backup snapshots.
 
-.. _backup_snapshot:
+.. _term_backup_snapshot:
 
 Backup Snapshot
 ---------------