[tldoc] Update default value of hash_extra

[muzimuzhi Z]

Hi,

The TeX Live Guide—2020, sec. 7.3 Runtime options [1] says

> The default value of hash_extra is 50000.

But this default value is now 600000. It was increased
 - from 50,000 to 200,000 in texlive/r14629 [2], and then
 - from 200,000 to 600,000 in texlive/r28382, in Aug 2012 [3].

Also, I'm not sure if the description
> Only ≈10,000 control sequences can be stored in the main hash table
in the same section is still accurate or need an update too.

PS: It is Marcel Krüger's TeX-SX answer to question _tex.hashtokens
incomplete?_ [4] which leads me to find this typo.

[1] https://www.tug.org/texlive/doc/texlive-en/texlive-en.html#x1-670007.3
[2]
http://www.tug.org/svn/texlive/trunk/Master/texmf/web2c/texmf.cnf?r1=14629&r2=14628&pathrev=14629
[3]
http://www.tug.org/svn/texlive/trunk/Build/source/texk/kpathsea/texmf.cnf?r1=28382&r2=28381&pathrev=28382
[4] https://tex.stackexchange.com/a/574620/


best regards,
Yukai Chou
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