CURLrequest - getShared does't work

That is not a bug.

1. Services returns basically shared instance. So the second options are ignored. It may be a bit tricky, so added the explanation in the User Guide. See https://codeigniter4.github.io/CodeIgnit...t-a-servic

2. CURLRequest never reset options passed to the constructor. See the Note: https://codeigniter4.github.io/CodeIgnit...he-library

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