Port contents of Documentation/ModuleAliasing.md to DocC

[bripeticca]

Fixes #8588

Migrate the contents of Documentation/ModuleAliasing.md to our DocC catalog in Sources/PackageManagerDocs/Documentation.docc/ModuleAliasing.md.

[heckj]

Suggested change

	Learn how to use module aliasing with SwiftPM.
	Create aliased names for modules to avoid collisions between targets in your package or its dependencies.

^ What do you think of the above as an abstract - calling out the action you'd take (what this article describes), and why you'd want/need to do so.

[heckj]

Suggested change

	The number of package dependencies often grows, with that, a name collision can occur among modules from different packages. Module names such as `Logging` or `Utils` are common examples. In order to resolve the collision, SwiftPM (in 5.7+) introduces a new parameter `moduleAliases`, which allows a user to define new unique names for the conflicting modules without requiring any source code changes.
	As you add dependencies to your package, a name collision can occur among modules from different packages.
	Module names such as `Logging` or `Utils` are common examples.
	In order to resolve the collision, package manager, from Swift 5.7 or later, provides the parameter `moduleAliases` when defining dependencies for targets.
	You define new unique names for the modules that would otherwise conflict, without requiring any source code changes.

Breaking up the sentences to one per line, and revising some of them towards active voice, as well as spelling out the detail about Swift 5.7 or later being required.

[heckj]

I'm still thinking your idea of moving this up to the top of the article would be much better - and the first line item can be dropped, as it's clearly spelled out in the overview, which introduces the idea of a module alias.

As I'm reading this through later, this list of constraints on using module aliasing seems like it would be great as a second paragraph in the overview, just to get it up front and clearly in eyes view when hitting this page.