Merge pull request #644 from TheBizzle/5.x

Correcting dictionary entry for `create-temporary-plot-pen`
Fix typo in shapes.html
Merge pull request #648 from aochagavia/patch-1

Fix typo in shapes.html
revise Mac OS X requirements wording

hoping to avoid a misreading where users might construe it as vital
to go chasing after the latest Java
Clarifying documentation for `plot-pen-reset`