Add example for update po command

README.md

@@ -270,12 +270,26 @@ This behaves similarly to the [msgmerge](https://www.gnu.org/software/gettext/ma
 **OPTIONS**
 
 	<source>
-		Path to an existing POT file to use for updating
+		Path to an existing POT file to use for updating.
 
 	[<destination>]
 		PO file to update or a directory containing multiple PO files.
 		  Defaults to all PO files in the source directory.
 
+**EXAMPLES**
+
+    # Update all PO files from a POT file in the same directory.
+    $ wp i18n update-po example-plugin.pot
+    Success: Updated 3 files.
+
+    # Update a PO file from a POT file.
+    $ wp i18n update-po example-plugin.pot example-plugin-de_DE.po
+    Success: Updated 1 file.
+
+    # Update all PO files from a POT file in the specific directory.
+    $ wp i18n update-po example-plugin.pot languages
+    Success: Updated 2 files.
+
 ## Installing
 
 This package is included with WP-CLI itself, no additional installation necessary.

src/UpdatePoCommand.php

@@ -21,12 +21,26 @@ class UpdatePoCommand extends WP_CLI_Command {
 	 * ## OPTIONS
 	 *
 	 * <source>
-	 * : Path to an existing POT file to use for updating
+	 * : Path to an existing POT file to use for updating.
 	 *
 	 * [<destination>]
 	 * : PO file to update or a directory containing multiple PO files.
 	 *   Defaults to all PO files in the source directory.
 	 *
+	 * ## EXAMPLES
+	 *
+	 *     # Update all PO files from a POT file in the same directory.
+	 *     $ wp i18n update-po example-plugin.pot
+	 *     Success: Updated 3 files.
+	 *
+	 *     # Update a PO file from a POT file.
+	 *     $ wp i18n update-po example-plugin.pot example-plugin-de_DE.po
+	 *     Success: Updated 1 file.
+	 *
+	 *     # Update all PO files from a POT file in the specific directory.
+	 *     $ wp i18n update-po example-plugin.pot languages
+	 *     Success: Updated 2 files.
+	 *
 	 * @when before_wp_load
 	 *
 	 * @throws WP_CLI\ExitException