Update Imagick method synopses (#4118)

[stefanfisk]

The argument names were wrong for a lot of methods.

I'm not entirely sure that I know what I'm doing, but the steps I took were:

1. Clone php/doc-en, php/doc-base, php/php-src and Imagick/imagick
2. Manually fix the stub signature for Imagick::newImage() like in Fix nullable in Imagick.stub.php Imagick/imagick#674
3. ./php-src/build/gen_stub.php --replace-methodsynopses ./imagick/*.stub.php ./doc-en/reference/imagick/

Resolves #4118.

[stefanfisk]

I also had to do some manual cleanup of trailing white space.

[Girgias]

Could you maybe do this class by class in different PRs? As the stub changes currently also impacts how Xincludes are down in the class synopsis, so you probably need to also run ./php-src/build/gen_stub.php --replace-classsynopses ./imagick/*.stub.php ./doc-en/reference/imagick/ :)