Minor style changes for a RTDB comment block (#1857)

* Fixing some formatting.

* Making some minor style changes in comments for database.Reference.push().

Author: egilmorez

packages/firebase/index.d.ts

@@ -4838,13 +4838,13 @@ declare namespace firebase.database {
      *
      * This is the most common pattern for adding data to a collection of items.
      *
-     * If you provide a value to `push()`, the value will be written to the
-     * generated location. If you don't pass a value, nothing will be written to the
-     * Database and the child will remain empty (but you can use the `Reference`
+     * If you provide a value to `push()`, the value is written to the
+     * generated location. If you don't pass a value, nothing is written to the
+     * database and the child remains empty (but you can use the `Reference`
      * elsewhere).
      *
-     * The unique key generated by `push()` are ordered by the current time, so the
-     * resulting list of items will be chronologically sorted. The keys are also
+     * The unique keys generated by `push()` are ordered by the current time, so the
+     * resulting list of items is chronologically sorted. The keys are also
      * designed to be unguessable (they contain 72 random bits of entropy).
      *
      *
@@ -4874,9 +4874,8 @@ declare namespace firebase.database {
      * @param value Optional value to be written at the generated location.
      * @param onComplete Callback called when write to server is
      *   complete.
-     * @return Combined `Promise` and
-     *   `Reference`; resolves when write is complete, but can be used immediately
-     *   as the `Reference` to the child location.
+     * @return Combined `Promise` and `Reference`; resolves when write is complete, but can be
+     *   used immediately as the `Reference` to the child location.
      */
     push(
       value?: any,