Fix a few typos in the "Base images" manual (docker#22486)

## Description

The pull request fixes a few minor typos in the "Base images" manual.

Author: duffuniverse

content/manuals/build/building/base-images.md

@@ -22,7 +22,7 @@ For most cases, you don't need to create your own base image. Docker Hub
 contains a vast library of Docker images that are suitable for use as a base
 image in your build. [Docker Official
 Images](../../docker-hub/image-library/trusted-content.md#docker-official-images)
-have clear documentation, promote best practices, and are regularly updated
+have clear documentation, promote best practices, and are regularly updated.
 There are also [Docker Verified
 Publisher](../../docker-hub/image-library/trusted-content.md#verified-publisher-images)
 images, created by trusted publishing partners, verified by Docker.
@@ -77,7 +77,7 @@ To run your new image, use the `docker run` command:
 $ docker run --rm hello
 ```
 
-This example image can only successfully execute as long as the `hello` binary
+This example image can only be successfully executed as long as the `hello` binary
 doesn't have any runtime dependencies. Computer programs tend to depend on
 certain other programs or resources to exist in the runtime environment. For
 example: