fixed typo in buildingblocks.rst

docs/sources/concepts/buildingblocks.rst

@@ -10,7 +10,7 @@ Building blocks
 
 Images
 ------
-An original container image. These are stored on disk and are comparable with what you normally expect from a stoppped virtual machine image. Images are stored (and retrieved from) repository
+An original container image. These are stored on disk and are comparable with what you normally expect from a stopped virtual machine image. Images are stored (and retrieved from) repository
 
 Images are stored on your local file system under /var/lib/docker/images