Merge pull request #21445 from AJDempsey/patch-1

Update keep context small bullet point in optimize.md

Author: dvdksn

content/manuals/build/cache/optimize.md

@@ -19,7 +19,7 @@ the build process:
   invalidation.
 - [Keep the context small](#keep-the-context-small): The context is the set of
   files and directories that are sent to the builder to process a build
-  instruction. Keeping the context as small reduces the amount of data that
+  instruction. Keeping the context as small as possible reduces the amount of data that
   needs to be sent to the builder, and reduces the likelihood of cache
   invalidation.
 - [Use bind mounts](#use-bind-mounts): Bind mounts let you mount a file or