Update autocomplete-valid-value-73f2c2.md

[giacomo-petri]

Updates:

• updated fixed values list item in Applicability section adding necessary type values to reflect html specs;
• removed "hidden" type from that list;
• added background note both to better explain fixed values and to clarify autofill anchor mantle for input type hidden.

Closes issue(s):

• closes Autocomplete attribute has valid value - Input type image [73f2c2] act-rules/act-rules.github.io#1901

Need for Call for Review:
This will require a 2 weeks Call for Review

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