Fix typo

[tkoyama010]

Fix a small typo.

[codecov]

Codecov Report

Merging #1176 (fd4d263) into master (083e5da) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head fd4d263 differs from pull request most recent head e80ad12. Consider uploading reports for the commit e80ad12 to get more accurate results

@@           Coverage Diff           @@
##           master    #1176   +/-   ##
=======================================
  Coverage   94.01%   94.01%           
=======================================
  Files          26       26           
  Lines        5411     5412    +1     
  Branches      918      919    +1     
=======================================
+ Hits         5087     5088    +1     
  Misses        193      193           
  Partials      131      131           

Impacted Files	Coverage Δ
cadquery/assembly.py	96.56% <100.00%> (+0.01%)	⬆️

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[lorenzncode]

While we're at it, what about the following?:
L99 "lets step through it"
L159 "lets break it down a bit"

The subsection capitalization is inconsistent in this section. In some cases title case is used and others sentence case. The capitalization is wrong either way of "A" in the line directly above this change.
"Start With A single, simple Plate"

For the subsections, I'd suggest:
Prerequisites: conda + CQ-editor running from an environment (no change)
What we'll accomplish (no change)
Start with a single, simple plate
Add the holes
More holes
... no change to remaining subsection titles.

[adam-urbanczyk]

Should I just merge this PR, or are you still working on it?

[hiaselhans]

I don't have a vote here, but in order to keep the PR section clean, i would just merge it and hope for @lorenzncode to apply his changes at a later point :)

[tkoyama010]

Sorry for the late reply. It is ready for merge.

[lorenzncode]

Thanks for addressing all instances of the typo in the file.

[adam-urbanczyk]

Thanks @tkoyama010 !