Rollup merge of #144758 - QnJ1c2kNCg:master, r=Noratrieb

[Doc] Add links to the various collections

Add a few links to the collections mentioned in the module doc for Collections.

Author: jhpratt

library/std/src/collections/mod.rs

@@ -26,7 +26,7 @@
 //! should be considered. Detailed discussions of strengths and weaknesses of
 //! individual collections can be found on their own documentation pages.
 //!
-//! ### Use a `Vec` when:
+//! ### Use a [`Vec`] when:
 //! * You want to collect items up to be processed or sent elsewhere later, and
 //!   don't care about any properties of the actual values being stored.
 //! * You want a sequence of elements in a particular order, and will only be
@@ -35,25 +35,25 @@
 //! * You want a resizable array.
 //! * You want a heap-allocated array.
 //!
-//! ### Use a `VecDeque` when:
+//! ### Use a [`VecDeque`] when:
 //! * You want a [`Vec`] that supports efficient insertion at both ends of the
 //!   sequence.
 //! * You want a queue.
 //! * You want a double-ended queue (deque).
 //!
-//! ### Use a `LinkedList` when:
+//! ### Use a [`LinkedList`] when:
 //! * You want a [`Vec`] or [`VecDeque`] of unknown size, and can't tolerate
 //!   amortization.
 //! * You want to efficiently split and append lists.
 //! * You are *absolutely* certain you *really*, *truly*, want a doubly linked
 //!   list.
 //!
-//! ### Use a `HashMap` when:
+//! ### Use a [`HashMap`] when:
 //! * You want to associate arbitrary keys with an arbitrary value.
 //! * You want a cache.
 //! * You want a map, with no extra functionality.
 //!
-//! ### Use a `BTreeMap` when:
+//! ### Use a [`BTreeMap`] when:
 //! * You want a map sorted by its keys.
 //! * You want to be able to get a range of entries on-demand.
 //! * You're interested in what the smallest or largest key-value pair is.
@@ -65,7 +65,7 @@
 //! * There is no meaningful value to associate with your keys.
 //! * You just want a set.
 //!
-//! ### Use a `BinaryHeap` when:
+//! ### Use a [`BinaryHeap`] when:
 //!
 //! * You want to store a bunch of elements, but only ever want to process the
 //!   "biggest" or "most important" one at any given time.