correct typo in multiple data block example

[huwjenkins]

The multiple data block example in the documentation mistakenly refers to an argument force_dict when this is always_dict:

https://github.com/teamtomo/starfile/blob/13d35c76d3a9e394fe8913ffc495aa56f745e56d/src/starfile/functions.py#L29-L30

https://github.com/teamtomo/starfile/blob/13d35c76d3a9e394fe8913ffc495aa56f745e56d/src/starfile/functions.py#L38-L39

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Codecov Report

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

Project coverage is 82.73%. Comparing base (5b19406) to head (97e069b). Report is 16 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #67 +/- ## ========================================== + Coverage 80.93% 82.73% +1.80% ========================================== Files 7 7 Lines 278 307 +29 ========================================== + Hits 225 254 +29 Misses 53 53 ```

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[alisterburt]

Great catch @huwjenkins - thank you for the PR!