Fix spelling "setup" -> "set up" and similar

* Replace "setup", "lookup", "cleanup", "backup" with
  "set up", "look up", "clean up", "back up"
  when used as verbs. Replace also variations of those.

* Improve language in a few places.

Signed-off-by: Erik Sjölund <erik.sjolund@gmail.com>

docs/tutorials/README.md

@@ -6,11 +6,11 @@
 
 **[Introduction Tutorial](podman_tutorial.md)**
 
-Learn how to setup Podman and perform some basic commands with the utility.
+Learn how to set up Podman and perform some basic commands with the utility.
 
 **[Basic Setup and Use of Podman in a Rootless environment](rootless_tutorial.md)**
 
-The steps required to setup rootless Podman are enumerated.
+The steps required to set up rootless Podman are enumerated.
 
 **[Setup Mac/Windows](mac_win_client.md)**
 
@@ -26,7 +26,7 @@ How the libpod API can be used within your own project.
 
 **[Image Signing](image_signing.md)**
 
-Learn how to setup and use image signing with Podman.
+Learn how to set up and use image signing with Podman.
 
 **[Basic Networking](basic_networking.md)**
 

docs/tutorials/podman_tutorial.md

@@ -142,7 +142,7 @@ podman rm --latest
 You can verify the deletion of the container by running *podman ps -a*.
 
 ## Integration Tests
-For more information on how to setup and run the integration tests in your environment, checkout the Integration Tests [README.md](../../test/README.md)
+For more information on how to set up and run the integration tests in your environment, checkout the Integration Tests [README.md](../../test/README.md)
 
 ## More information