PEP 701: Fix typos (#3054)

pep-0701.rst

@@ -477,9 +477,9 @@ Here are some of the arguments in favour:
 
 * Code generators (like `ast.unparse <https://docs.python.org/3/library/ast.html#ast.unparse>`_ from standard library) in their
   current form rely on complicated algorithms to ensure expressions within an f-string are properly suited for the context in
-  which they are being used. These non-trivial algorithms come with challanges such as finding an unused quote type (by tracking
+  which they are being used. These non-trivial algorithms come with challenges such as finding an unused quote type (by tracking
   the outer quotes), and generating string representations which would not include backslashes if possible. Allowing quote reuse
-  and backslashes would simplify the code generators which deals with f-strings considerably, as the regular Python expression logic
+  and backslashes would simplify the code generators which deal with f-strings considerably, as the regular Python expression logic
   can be used inside and outside of f-strings without any special treatment.
 
 * Limiting quote reuse will considerably increase the complexity of the implementation of the proposed changes. This is because
@@ -559,7 +559,7 @@ Rejected Ideas
     >>> f'Useless use of lambdas: { lambda x: x*2 }'
     SyntaxError: unexpected EOF while parsing
 
-   The reason is that this would this will introduce a considerable amount of
+   The reason is that this will introduce a considerable amount of
    complexity for no real benefit. This is due to the fact that the ``:`` character
    normally separates the f-string format specification. This format specification
    is currently tokenized as a string. As the tokenizer MUST tokenize what's on the