improves lendocs

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fixes #72

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I think this is sane. One can always do ptr.tokens().count() for the alternative definition of "length".

I see that you've copied the doc-comment from str::len. This is mostly accurate, since we do indeed just delegate to that method, but the semantics is not quite right. I think we could go with something simpler instead, along the lines of:

/// This length expresses the byte count of the underlying string that represents the RFC 6091 Pointer. See also [std::str::len].

Although the caveat with char/graphemes applies, it's less important for us than the relationship with std::str.

Originally posted by @asmello in #69 (comment)

Carry over from the above.

I guess I leave len and is_empty on PointerBuf for now, right? Ugh. I realized I had accidentally added them to PointerBuf and I thought I deleted them to move them on to Pointer but I guess I yanked them instead :(.

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I yanked v06.2 - i seriously doubt it'd be a breaking change for anyone but I wanted to make sure since the CI reported it as such.