need inline doc for html

[bill]

I noticed these functions were missing inline doc:

• dojo.coords()
• dojo.marginBox(), dojo.contentBox()
• dojo.style(), dojo.getComputedStyle()
• dojo.createElement() (this is also missing an implementation)

In particular, dojo.coords() returns a structure w/ l,h,x,y parameters. What's the difference between l and x?

[sjmiles]

I will endeavor to improve docs, but note that Alex is the module owner.

[dante]

debugging/testcase page ... may be helpful?

[alex]

(In [9412]) adding inline docs for html functions. Fixes #3162