Clarity reference missing string-ascii and string-utf8 references for many functions

[psq]

when string-ascii and string-utf8 were introduced, many functions documentation in the Clarity reference were not modified to include references to these new types when applicable (used to be a buff but I doubt many new people are aware of that).

Example of functions that can take a string (either ascii or utf8), but not the exhaustive list:

• as-max-len?
  instead of

Input: buff|list, uint
Output: (optional buff|list)

it should have

Input: buff|list|string-ascii|string-utf8, uint
Output: (optional buff|list|string-ascii|string-utf8)

• concat
• index-of (some of the examples even use ascii strings)
• element-at
• index-of
• hash160 (not sure this would take it a string)
• ...

Also, more examples could use the string-utf8, there is only 1 reference that I could find to the utf8 string notation u"abcd" in the whole reference (https://docs.stacks.co/references/language-types)

cc @pgray-hiro

[blockstack-devops]

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