doc: add a notice that unchecked resolving is faster for BufferBackend

[Ddystopia]

Judging only by docs it looked like BufferBackend is extremely inferior. After checking it's implementation, running benchmarks and comparing implementation to other backends it seems like absolutely superior backend, assuming the Symbol is correct.

This PR adds a notice that resolve_unchedked is quite fast for BufferBackend, exceeding other backends (23-28 % faster on my machine).

[codecov-commenter]

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All modified and coverable lines are covered by tests ✅

Project coverage is 60.98%. Comparing base (233bc6c) to head (21728bb).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
- Coverage   61.10%   60.98%   -0.12%     
==========================================
  Files          12       12              
  Lines         509      510       +1     
==========================================
  Hits          311      311              
- Misses        198      199       +1     

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[Ddystopia]

It says outdated deps, not sure if that PR has to do anything with it

[Robbepop]

Thanks for the PR! Indeed this is probably a useful information to users.

[Robbepop]

Suggested change

	//! are performed. If you will only use symbols probided by the same instance of
	//! are performed. If you will only use symbols provided by the same instance of

[Ddystopia]

@Robbepop I didn't fix the typo, it is in the repo now

[Robbepop]

@Robbepop I didn't fix the typo, it is in the repo now

Ah sorry I forgot about that. Feel free to open another PR to fix it if you want.