badwords: make some words match case-insensitively

Also:
- wcurl.md: sync with upstream to pass the badwords check.

Ref: 11f840cddd
Ref: https://github.com/curl/wcurl/pull/79

Closes #19713

.github/scripts/badwords.txt

@@ -17,7 +17,7 @@ could've:could have
 couldn't:could not
 didn't:did not
 doesn't:does not
-don't=do not
+don't:do not
 haven't:have not
 i'd:I would
 i'll:I will
@@ -74,10 +74,10 @@ file names\b:filenames
 \buser names\b:usernames
 \bpass phrase:passphrase
 \bwill\b:rewrite to present tense
-\b32bit=32-bit
-\b64bit=64-bit
-32 bit\b=32-bit
-64 bit\b=64-bit
+\b32bit:32-bit
+\b64bit:64-bit
+32 bit\b:32-bit
+64 bit\b:64-bit
 64-bits:64 bits or 64-bit
 32-bits:32 bits or 32-bit
 \bvery\b:rephrase using an alternative word