KCL docs improvements (#4043)

* Preserve paragraph breaks in the KCL docs

The KCL docs on the website are hard to read, because they concatenate all
the paragraphs in my nicely-formatted docstrings in the stdlib functions
into one big paragraph. PR should fix this.

* Fix arc docs being split into two lines

The 'summary' section of the docs has a maximum line length, and if you
go over that length, your summary gets split into two lines weirdly.

Makes the arc docs shorter, so the summary is back to one line like
it should be.

* Update docs for pattern transform

docs/kcl/revolve.md

@@ -7,6 +7,7 @@ layout: manual
 Rotate a sketch around some provided axis, creating a solid from its extent.
 
 This, like extrude, is able to create a 3-dimensional solid from a 2-dimensional sketch. However, unlike extrude, this creates a solid by using the extent of the sketch as its revolved around an axis rather than using the extent of the sketch linearly translated through a third dimension.
+
 Revolve occurs around a local sketch axis rather than a global axis.
 
 ```js