Matt Peel a61cb1de99 Fix reference to webconfig.php, an invalid file
The upgrading docs reference webconfig.php, which is incorrect and has never existed. I presume the docs mean to reference web.config, which is the IIS configuration file.

I've also fixed a couple of minor spelling mistakes and mentioned Apache for htaccess and IIS for web.config so people know what they're for.

[ci skip]
2019-04-30 08:55:03 +12:00
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