doc: fix optionality of callback arg of checkPrime

The callback argument is required.

PR-URL: #44311
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>

Author: tniessen

doc/api/crypto.md

@@ -2904,7 +2904,7 @@ is currently in use. Setting to true requires a FIPS build of Node.js.
 This property is deprecated. Please use `crypto.setFips()` and
 `crypto.getFips()` instead.
 
-### `crypto.checkPrime(candidate[, options[, callback]])`
+### `crypto.checkPrime(candidate[, options], callback)`
 
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