feat(applying-patch): improve documentationo to also mention git apply as alternative

Signed-off-by: Simon L. <[email protected]>

Author: szaimen

admin_manual/issues/applying_patch.rst

@@ -28,6 +28,11 @@ Patching server
 
     patch -p 1 < /path/to/the/file.patch
 
+3. Alternatively, if the patch command is not available, use::
+
+    git apply --check /path/to/the/file.diff
+    git apply /path/to/the/file.diff
+
 Patching apps
 ^^^^^^^^^^^^^
 
@@ -42,6 +47,10 @@ Reverting a patch
 
     patch -R -p 1 < /path/to/the/file.patch
 
+3. Alternatively, if the patch command is not available, use::
+
+    git apply --reverse /path/to/the/file.diff
+
 Notes and troubleshooting
 -------------------------