Correct formatting of cboreHole(), cskHole(), and hole() example code

[sethfischer]

Correct formatting of code block.

See https://cadquery.readthedocs.io/en/latest/classreference.html?highlight=cboreHole#cadquery.Workplane.cboreHole which is rendered on a single line with superfluous horizontal whitespace.

[codecov]

Codecov Report

Merging #1062 (2eebfe9) into master (9745762) will not change coverage.
The diff coverage is n/a.

❗ Current head 2eebfe9 differs from pull request most recent head 4bbf8a5. Consider uploading reports for the commit 4bbf8a5 to get more accurate results

@@           Coverage Diff           @@
##           master    #1062   +/-   ##
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  Coverage   96.34%   96.34%           
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  Files          40       40           
  Lines        9533     9533           
  Branches     1259     1259           
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  Hits         9185     9185           
  Misses        205      205           
  Partials      143      143           

Impacted Files	Coverage Δ
cadquery/cq.py	92.43% <ø> (ø)

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[jmwright]

@sethfischer Unless you wrap everything after the assignment = in parentheses, I think you'll still need the line continuation characters.

[sethfischer]

Amended to escape line continuation character which results in a correctly rendered code block. The same correction was made in cskHole() and hole().

Also completed a truncated comment for cboreHole() to match cskHole() and hole().

[lorenzncode]

I'd suggest to format these with black to be consistent with the other examples and also remove Plane.XY().

[jmwright]

With the latest changes it looks good to me, and all the checks pass. Thanks @sethfischer

@lorenzncode Once you confirm that it looks good to you, please feel free to merge.

[lorenzncode]

Thanks @sethfischer.