[DOC] A fix to inconsistent double tick quote for the classification.distance_based module

[Ahmed-Zahran02]

Reference Issues/PRs

Fixes #809

What does this implement/fix? Explain your changes.

This PR fixes the inconsistent use of double tick quotes in docstring #809
In the Classification.distance_based module i fixed all the misusage of tick quotes.
for example:

n_jobs : int, default=1
      The number of jobs to run in parallel for both ``fit`` and ``predict``.
      `-1` means using all processors.

Does your contribution introduce a new dependency? If yes, which one?

No

Any other comments?

None

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