Fix some broken references in the docs.

Author: rwb27

docs/source/actions.rst

@@ -58,7 +58,8 @@ The first is ``self`` (the first positional argument), which is always the
 supply resources needed by the action. Most often, this is a way of accessing
 other `.Things` on the same server.
 
-.. action_logging:
+.. _action_logging:
+
 Logging from actions
 --------------------
 Action code should use `.Thing.logger` to log messages. This will be configured
@@ -70,7 +71,8 @@ a long time to run, or it may simply be a helpful debugging aid.
 
 See :mod:`.logs` for details of how this is implemented.
 
-.. action_cancellation:
+.. _action_cancellation:
+
 Cancelling actions
 ------------------
 If an action could run for a long time, it is useful to be able to cancel it
@@ -82,7 +84,8 @@ is equivalent,  but will raise an exception if the action is cancelled.
 
 For more advanced options, see `.invocation_contexts` for detail.
 
-.. invocation_context:
+.. _invocation_context:
+
 Invocation contexts
 -------------------
 Cancelling actions and capturing their logs requires action code to use a

docs/source/index.rst

@@ -34,7 +34,7 @@ Previous version
 ----------------
 
 This is a ground-up rewrite of python-labthings_, replacing Flask 1 and Marshmallow with FastAPI and Pydantic. 
-Compared to `python-labthings`_, this framework updates dependencies, shrinks the codebase, and simplifies the API  (see :doc:`lt_structure`).
+Compared to `python-labthings`_, this framework updates dependencies, shrinks the codebase, and simplifies the API  (see :doc:`structure`).
 * FastAPI more or less completely eliminates OpenAPI generation code from our codebase
 * Marshmallow schemas and endpoint classes are replaced with Python type hints, eliminating double- or triple-definition of actions and their inputs/outputs.
 * Thing Description generation is very much simplified by the new structure (multiple Things instead of one massive Thing with many extensions)

docs/source/thing_slots.rst

@@ -1,4 +1,4 @@
-.. thing_slots:
+.. _thing_slots:
 
 Thing Slots
 ===========