Fix typo in KeyedVectors.wmdistance

[dnabanita7]

Fix part of #2228

[gojomo]

Thanks for the first-time contribution!

A PR may get more attention with a more descriptive title. For example, this might have caught someone's eye earlier with a title like "Fix comment typo in KeyedVectors". You can correct this via the 'edit' button to the right of the title in the Github interface. (You don't nee to open a second PR to change the title or even the mix of commits included.)

If the PR is addressing a specific issue, naming it in both the title and initial comment is helpful. (I suspect from other activity the idea to fix this may have come from #2228.) Whether the PR completely fixes the issue, or is a partial/work-in-progress fix, can be mentioned, too, to help reviewers.

At the moment, automatic tests are failing (as indicated by the red-X's shown nearby) – though that's almost certainly not the fault of this patch. It appears to be in unrelated documentation-contstruction step, and the output of that step is so large it doesn't even fully display at CircleCI. (@menshikh-iv is this a known issue someone is working on?)

[menshikh-iv]

Hello @naba7,
thanks for PR, please

• Add a proper description of current PR
• Add linked issue (looks like you didn't resolve pyemd import check is misplaced #2228 here, just change a comment a bit)
• Resolve an original issue pyemd import check is misplaced #2228
• Merge current develop to your branch (to fix CI issues)

[menshikh-iv]

thanks for the contribution @naba7, typo already fixed in develop, closing