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] #1901

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

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[WilcoFiers]

It's probably worth adding some inapplicable examples for this.

[giacomo-petri]

It's probably worth adding some inapplicable examples for this.

Good catch. Added input type submit and hidden examples (trying to explain with an example the idea of the autofill anchor mantle).

Some changes done

As changes were made so worth rechecking

[giacomo-petri]

Call for review ends on February 13th.

[carlosapaduarte]

Call for review ended. Merging...