Minor typos in the user guide

[codecov[bot]]

Codecov Report

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

Comparison is base (b603ff6) 87.44% compared to head (288acd2) 87.44%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1171 +/- ## ======================================= Coverage 87.44% 87.44% ======================================= Files 113 113 Lines 10236 10236 Branches 4057 4057 ======================================= Hits 8951 8951 Misses 692 692 Partials 593 593 ```

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[marscher]

thank you