rustdoc: Make static initalizers prettier

Previously, if an initializer took multiple lines or was just large in general,
it was pretty poorly rendered [1] [2]. This alters the logic to just link back
to the source for any multi-line static, with a placeholder of "[definition]".
This should make reading statics a little easier on the eyes. All single-line
statics are still inlined in the documentation.

Closes #13198

[1] - http://static.rust-lang.org/doc/master/sync/mutex/index.html#statics
[2] - http://static.rust-lang.org/doc/master/std/sync/atomics/index.html#statics

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