DOCSP-40526 compact dryRun example (#8452)

* compact dryRun example

* DOCSP-40526 dryRun example

* Title change

* Title change

* Testing copyable input build

* Testing copyable input build

* Suggestion per Sarah Olson

Author: kennethdyer

source/reference/command/compact.txt

@@ -293,21 +293,50 @@ collection, MongoDB returns an error.
 Example
 -------
 
+Compact a Collection
+~~~~~~~~~~~~~~~~~~~~
+
 The following operation runs the ``compact`` command on the
 ``movies`` collection:
 
-.. code-block:: javascript
+.. io-code-block::
+   :copyable: true
 
-   db.runCommand( { compact: "movies" } )
+   .. input::
+      :language: javascript
 
-Running ``compact`` returns output similar to the following:
+      db.runCommand( { compact: "movies" } )
+
+   .. output::
+      :language: javascript
+
+      { bytesFreed: 27859, ok: 1 }
+
+Estimate Compaction
+~~~~~~~~~~~~~~~~~~~~
+
+The following operation performs a dry run of the ``compact`` command on the
+``movies`` collection:
+
+.. io-code-block::
+   :copyable: true
+
+   .. input::
+      :language: javascript
+
+      db.runCommand( {
+         compact: "movies",
+         dryRun: true
+      } )
+
+   .. output::
+      :language: javascript
+
+      { estimatedBytesFreed: 27859, ok: 1 }
 
-.. code-block:: javascript
-   :copyable: false
 
-   { bytesFreed: 27859, ok: 1 }
 
-Learn More 
+Learn More
 ----------
 
 - :dbcommand:`autoCompact`