Note that controllers do not need to be single individuals.

[msporny]

This PR is an attempt to address issue #45 by noting that no assumptions are to be made about a controller being a single individual nor only controlling a single verification method.

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[selfissued]

Suggested change

	While the identifier used for a [=controller=] is unique, that uniqueness does
	not imply that a single individual is always the controller, nor does it imply
	that the controller might not be associated by multiple identifiers. A
	[=controller=] might be a single individual, or a collection of individuals,
	such as a corporation. A [=controller=] might also use multiple identifiers
	to refer to itself, for purposes such as privacy or delineating operational
	boundaries within an organization. Similarly, a [=controller=] might control
	many [=verification methods=] and so no assumptions are to be made about
	a [=controller=] being a single individual nor only controlling a single
	[=verification method=].
	While the identifier used for a [=controller=] is unique, that uniqueness does
	not imply that a single entity is always the controller, nor does it imply
	that the controller might not be associated by multiple identifiers. A
	[=controller=] might be a single entity, or a collection of entities,
	such as a corporation. A [=controller=] might also use multiple identifiers
	to refer to itself, for purposes such as privacy or delineating operational
	boundaries within an organization. Similarly, a [=controller=] might control
	many [=verification methods=] and so no assumptions are to be made about
	a [=controller=] being a single entity nor only controlling a single
	[=verification method=].

Controllers also need not be persons - hence "entity" is a better word than "individual"

[msporny]

I applied this in another commit due to @David-Chadwick's changes conflicting w/ these changes.

[David-Chadwick]

Subject to editorial changes.

[msporny]

Editorial, multiple reviews, changes requested and made, no objections, merging.