fix: Pegleg exceptions documentation incorrectly rendering

This patch set changes Pegleg's exceptions documentation
(contained underneath operators guide) because it isn't rendering
correctly as a list table on RTD (the autoexception information
is missing) [0].

The easy fix is to change the tabularized view (list table)
into basically a series of autoexception classes which sufficiently
captures the level of detail required, anyway.

Note that running `tox -e docs` locally and opening the resulting
index.html page appears to work -- but not when hosted on RTD.

[0] https://airship-pegleg.readthedocs.io/en/latest/exceptions.html

Change-Id: Ie4bc01f1fe6aee9b9a58fd956f5b350df44bef51

doc/source/exceptions.rst

@@ -20,53 +20,39 @@ Pegleg  Exceptions
 Base Exceptions
 ---------------
 
-.. list-table::
-  :widths: 5 50
-  :header-rows: 1
-
-  * - Exception Name
-    - Description
-  * - PeglegBaseException
-    - .. autoexception:: pegleg.engine.exceptions.PeglegBaseException
-         :members:
-         :undoc-members:
+.. autoexception:: pegleg.engine.exceptions.PeglegBaseException
+   :members:
+   :undoc-members:
 
 Git Exceptions
 --------------
 
-.. list-table::
-  :widths: 5 50
-  :header-rows: 1
+.. autoexception:: pegleg.engine.exceptions.BaseGitException
+   :members:
+   :show-inheritance:
+   :undoc-members:
 
-  * - Exception Name
-    - Description
-  * - BaseGitException
-    - .. autoexception:: pegleg.engine.exceptions.BaseGitException
-         :members:
-         :show-inheritance:
-         :undoc-members:
-  * - GitConfigException
-    - .. autoexception:: pegleg.engine.exceptions.GitConfigException
-         :members:
-         :show-inheritance:
-         :undoc-members:
-  * - GitException
-    - .. autoexception:: pegleg.engine.exceptions.GitException
-         :members:
-         :show-inheritance:
-         :undoc-members:
-  * - GitAuthException
-    - .. autoexception:: pegleg.engine.exceptions.GitAuthException
-         :members:
-         :show-inheritance:
-         :undoc-members:
-  * - GitProxyException
-    - .. autoexception:: pegleg.engine.exceptions.GitProxyException
-         :members:
-         :show-inheritance:
-         :undoc-members:
-  * - GitSSHException
-    - .. autoexception:: pegleg.engine.exceptions.GitSSHException
-         :members:
-         :show-inheritance:
-         :undoc-members:
+.. autoexception:: pegleg.engine.exceptions.GitConfigException
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+.. autoexception:: pegleg.engine.exceptions.GitException
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+.. autoexception:: pegleg.engine.exceptions.GitAuthException
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+.. autoexception:: pegleg.engine.exceptions.GitProxyException
+   :members:
+   :show-inheritance:
+   :undoc-members:
+
+.. autoexception:: pegleg.engine.exceptions.GitSSHException
+   :members:
+   :show-inheritance:
+   :undoc-members: