Fix units on Docker shared memory documentation

doc/install/docker.md

@@ -621,7 +621,7 @@ variety of statistics on the health and performance of GitLab. The files
 required for this gets written to a temporary file system (like `/run` or
 `/dev/shm`).
 
-By default, Docker allocates 64Mb to the shared memory directory (mounted at
+By default, Docker allocates 64MB to the shared memory directory (mounted at
 `/dev/shm`). This is insufficient to hold all the Prometheus metrics related
 files generated, and will generate error logs like the following:
 
@@ -636,7 +636,7 @@ writing value to /dev/shm/gitlab/sidekiq/histogram_sidekiq_0-0.db failed with un
 ```
 
 Other than disabling the Prometheus Metrics from the Admin page, the recommended
-solution to fix this problem is to increase the size of shm to at least 256Mb.
+solution to fix this problem is to increase the size of shared memory to at least 256MB.
 If using `docker run`, this can be done by passing the flag `--shm-size 256m`.
 If using a `docker-compose.yml` file, the `shm_size` key can be used for this
 purpose.