Bug fixes in examples for Verb and Context Activities

* Fixed Verb example in 4.1.3 …
    Was not a valid Verb, although it contained a valid Verb. Brought the Verb out to the root level of the object to parallel the structure of examples given elsewhere in the document.

* Fixed Context Activities example in 4.1.6.2 …
    Spaces are not allowed in an IRI. Fixed indenting.