chore: Fix typo in doc context.rst

[BradleyKirton]

Checklist

• [x] I have double checked that there are no unrelated changes in this pull request (old patches, accidental config files, etc)
• [ ] I have created at least one test case for the changes I have made
• [x] I have updated the documentation for the changes I have made
• [x] I have added my changes to the CHANGELOG.md

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (82ef3ef) to head (6d1a689). Report is 153 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1890 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 80 80 Lines 2485 2514 +29 Branches 437 442 +5 ========================================= + Hits 2485 2514 +29 ```

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