Add examples using add_modify to HashMap

Updated the HashMap's documentation to include two references to
add_modify.

The first is when the `Entry` API is mentioned at the beginning. I was
hesitant to change the "attack" example (although I believe that it is
perfect example of where `add_modify` should be used) because both uses
work equally, but one is more idiomatic (`add_modify`).

The second is with the `entry` function that is used for the `Entry`
API. The code example was a perfect use for `add_modify`, which is why
it was changed to reflect that.

library/std/src/collections/hash/map.rs

@@ -164,6 +164,9 @@
 /// // update a key, guarding against the key possibly not being set
 /// let stat = player_stats.entry("attack").or_insert(100);
 /// *stat += random_stat_buff();
+///
+/// // modify an entry before an insert with in-place mutation
+/// player_stats.entry("mana").and_modify(|mana| *mana += 200).or_insert(100);
 /// ```
 ///
 /// The easiest way to use `HashMap` with a custom key type is to derive [`Eq`] and [`Hash`].
@@ -829,8 +832,7 @@ pub fn shrink_to(&mut self, min_capacity: usize) {
     /// let mut letters = HashMap::new();
     ///
     /// for ch in "a short treatise on fungi".chars() {
-    ///     let counter = letters.entry(ch).or_insert(0);
-    ///     *counter += 1;
+    ///     letters.entry(ch).and_modify(|counter| *counter += 1).or_insert(1);
     /// }
     ///
     /// assert_eq!(letters[&'s'], 2);