Update rfcs/0000-docker-image-tags.md

Co-authored-by: Christopher Sidebottom <chris.sidebottom@arm.com>

Author: leandron

rfcs/0000-docker-image-tags.md

@@ -26,7 +26,7 @@ None of these questions can be answered by our current numbering scheme, and to
 
 # Reference-level explanation
 
-As an improvement to the current situation, this RFC proposes the adption of a tagging scheme currently used in the `tlcpackstaging` (https://hub.docker.com/u/tlcpackstaging) repository, composed by:
+As an improvement to the current situation, this RFC proposes the adoption of a tagging scheme currently used in the `tlcpackstaging` (https://hub.docker.com/u/tlcpackstaging) repository, composed by:
 
 * a timestamp YYYYMMDD-HHMMSS
 * the last short git hash added in that image