Add a full stop

Co-authored-by: Beth <167304066+bprobert97@users.noreply.github.com>

Author: rwb27

src/labthings_fastapi/thing_property.py

@@ -807,7 +807,7 @@ def setting(
 ) -> FunctionalSetting[Value] | Value:
     r"""Define a Setting on a `.Thing`\ .
 
-    A setting is a property that is saved to disk
+    A setting is a property that is saved to disk.
 
     This function defines a setting, which is a special Property that will
     be saved to disk, so it persists even when the LabThings server is