Merged PR 221: Version 3 beta 2 doc changes

## Summary
*Replace this text with an explanation of what the changes are and how you implemented them. Can this impact any other parts of the codebase that we should keep in mind?*

## Test process
*How have you tested this (if applicable)?*

## Checklist
- [Y] PR is linked to a **work item**
- [Y] **acceptance criteria** of linked ticket are met
- [Y ] performed **self-review** of the code
- [N] written **tests** for any new functionality added with this PR
- [Y] updated the **documentation** if this PR changes or adds functionality
- [N] written/updated **design docs** if this PR implements new functionality
- [N] updated the **change log**
- [Y] ran **pre-commit** checks for code style
- [N] attended to any **TO-DOs** left in the code

Related work items: #2068

src/primaite/VERSION

@@ -1 +1 @@
-3.0.0a1
+3.0.0b2dev

src/primaite/exceptions.py

@@ -1,6 +1,6 @@
 # © Crown-owned copyright 2023, Defence Science and Technology Laboratory UK
 class PrimaiteError(Exception):
-    """The root PrimAITe Error."""
+    """The root PrimAITE Error."""
 
     pass