[ruby-core:100778] [Ruby master Bug#17317] In 2.7.2, Hash#except doesn't seem to exist, but is in the documentation

Issue #17317 has been reported by aquila12 (Nick Moriarty).

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Bug #17317: In 2.7.2, Hash#except doesn't seem to exist, but is in the documentation
https://bugs.ruby-lang.org/issues/17317

* Author: aquila12 (Nick Moriarty)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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According to https://ruby-doc.org/core-2.7.2/Hash.html#method-i-except, Hash#except is available in 2.7.2, but it doesn't appear to actually be there.

Run the following on the command line:
```
ruby -v -e 'h={a:1,b:2}; puts h, h.except(:a)'
```

Output:
```
ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux]
Traceback (most recent call last):
-e:1:in `<main>': undefined method `except' for {:a=>1, :b=>2}:Hash (NoMethodError)
```

This defines a Hash and then called `except` on it; the method appears to not be present although the docs indicate it is in this version.  Indeed, I cannot find rb_hash_except in hash.c for 2.7.2.



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