Update modify.md

second attempt to fix numbers

Author: rlpitts

docs/modify.md

@@ -190,11 +190,13 @@ This command is used to copy files or directories.
        mkdir testdir3
        ```
     4. Copy the new subdirectory ``testdir3`` to the directory ``testdir2``. Remember, "testdir2" is located outside "testdir1" and at the same "level". This can be done in more than one way. Remember you need the option ``-r`` (for recursive) when copying directories:
+    
         a) "Go up one" and then copy:
            ```bash
            cd ..
            cp -r testdir1/testdir3 testdir2/
            ```
+           
         b) Copy will standing inside ``testdir1``
            ```bash
            cp -r testdir3 ../testdir2