coding_guidelines: correct term from "alphabetical" to "chronological" order

[gplanansky]

https://github.com/neomjs/neo/blob/2001220a26c5c763102aa5fdc27bc6bf9af13463/.github/CODING_GUIDELINES.md

Should not "chronological" be "alphabetical"?

(19) Class content order:

    static configs (ordered chronologically)
    static config as the last item. This one does not need a comment, but is prefixed with an empty line.
    non-static class fields (ordered chronologically)
    construct() in case you are using it
    all other class methods are ordered chronologically and are prefixed with an empty line.

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