Adding documentation for UI Image constructors.

[Khalian]

Checklist

• [ ] New Extension
• [ ] New Test
• [x] Changed more than one extension, but all changes are related
• [x] Trivial change (doesn't require changelog)

[EZSwiftExtensionsBot]

	3 Messages
:book:	Executed 202 tests, with 0 failures (0 unexpected) in 5.301 (5.611) seconds
:book:	Executed 187 tests, with 0 failures (0 unexpected) in 4.570 (4.829) seconds
:book:	Executed 124 tests, with 0 failures (0 unexpected) in 4.388 (4.479) seconds

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