Fixing various spelling errors (#16924)

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## Summary

This is a cleanup PR. I am fixing various English language spelling
errors. This is mostly in docs and docstrings.

## Test Plan

The usual CI tests were run. I tried to build the docs (though I had
some troubles there). The testing needs here are, I trust, very low
impact. (Though I would happily test more.)

crates/red_knot_python_semantic/resources/mdtest/expression/lambda.md

@@ -76,7 +76,7 @@ Using a parameter with default value:
 lambda x=1: reveal_type(x)  # revealed: Unknown | Literal[1]
 ```
 
-Using a variadic paramter:
+Using a variadic parameter:
 
 ```py
 # TODO: should be `tuple[Unknown, ...]` (needs generics)