Merge pull request #21305 from yongtang/031716-typo

Fix several typos in the documentation.

docs/installation/mac.md

@@ -309,8 +309,7 @@ The `ACTIVE` machine, in this case `default`, is the one your environment is poi
     ![Bad Address](images/bad_host.png)
 
     This didn't work. The reason it doesn't work is your `DOCKER_HOST` address is
-    not the localhost address (0.0.0.0) but is instead the address of the
-    your Docker VM.
+    not the localhost address (0.0.0.0) but is instead the address of your Docker VM.
 
 5. Get the address of the `default` VM.
 

docs/security/trust/content_trust.md

@@ -30,7 +30,7 @@ ability to use digital signatures for data sent to and received from remote
 Docker registries. These signatures allow client-side verification of the
 integrity and publisher of specific image tags.
 
-Currently, content trust is disabled by default. You must enabled it by setting
+Currently, content trust is disabled by default. You must enable it by setting
 the `DOCKER_CONTENT_TRUST` environment variable. Refer to the
 [environment variables](../../reference/commandline/cli.md#environment-variables)
 and [Notary](../../reference/commandline/cli.md#notary) configuration