We know that brackets, [these], are used for altering or adding extra information to a direct quote. For example, from this answer:
These are used to indicate that a direct quote has been edited [or altered]
I have added extra information in the brackets. I am aware of how to change the capitalization. For example, if I quote something and the first letter is not capitalized and I want to capitalize it, I will enclose the first letter in brackets. Consider that "square brackets used while quoting" is a direct quote and I want to quote it but want to capitalize the first letter
[S]quare brackets used while quoting
However, what I'm wondering is a bit different.
Here is a direct quote from this answer:
Edit. I now realise that this answer misunderstands the question.
If I want to quote it and want to change "realise" to "realize" because I have used "realize" elsewhere... and I just want to change it (i.e. change a single word internal letter), should I just enclose the s/z in brackets or the whole word in brackets:
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Edit. I now reali[z]e that this answer misunderstands the question.
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Edit. I now [realize] that this answer misunderstands the question.
?
Most of the style guides I read don't mention it: