Minor typo fix in README

[DanielYang59]

No description provided.

[larsoner]

Thanks @DanielYang59

[peternewman]

Did you test this behaviour @DanielYang59 as I don't believe it's correct. IIRC the readme is effectively trying to say (and codespell's behaviour is):

When ignoring false positives, note that spelling errors are case-insensitive but words to ignore are case-sensitive based on how they appear in the dictionary. For example, the dictionary entry wrod will also match the typo Wrod, but to ignore either version you must pass wrod (because that is how it is listed in the dictionary).

[larsoner]

Oops I did not actually check... PR welcome to fix

[DanielYang59]

@peternewman @larsoner Apologize I didn't really check the behavior, I misunderstood the docs and thought it's simply a typo.

I could confirm @peternewman is correct:

wrod = 0  # codespell:ignore wrod
wrod = 0  # codespell:ignore Wrod  # Marked as spell error

Wrod = 1  # codespell:ignore wrod
Wrod = 1  # codespell:ignore Wrod  # Marked as spell error

to ignore either version you must pass wrod (because that is how it is listed in the dictionary).

I now understand what the docs are trying to convey (the "ignore pattern from config" is case sensitive and should match its corresponding entry from the dictionary). I thought to ignore Wrod you have to give Wrod

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However I still found the documentation confusing to me:

When ignoring false positives, note that spelling errors are case-insensitive but words to ignore are case-sensitive.

1. The meaning of "spelling error" (the error found from the file to be checked? ) was a bit vague to me when I read the docs. Because the "ignore pattern we give from config" is also a "spelling error", can we clarify to something like "spelling error in the target file"?

because that is how it is listed in the dictionary

2. I believe this should be mentioned in the README, as I'm a new user, and I don't know this behaviour at all after reading the Ignoring words section.

3. Also I found it a bit confusing to have "seemingly" different behaviours for different words, however I just had a quick look at the dictionary, it appears to me most (if not all) entries are lowercase (including names)? If that's the case, can we change the README to "the word to ignore should be lowercase" instead of "the word to ignore should be case-sensitive",

   Update: never mind, I do see word that is not lowercase. But wow, it's so confusing, why names are lowercase?

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What about ignore-words-list?

I don't really understand its behaviour, seems like #2375?

Say I have typo titel in target file, and using pattern titel works while TITEL doesn't (as expected).
Then I have another typo Mater in target file, and using both Mater/mater seems to work (why? the dict entry is mater)?