docs: improve help wording (#567)

Author: luke-codewalker

cmd/root.go

@@ -16,17 +16,17 @@ The Helm Diff Plugin
 * Shows a diff explaining what a helm upgrade would change:
     This fetches the currently deployed version of a release
   and compares it to a local chart plus values. This can be
-  used visualize what changes a helm upgrade will perform.
+  used to visualize what changes a helm upgrade will perform.
 
 * Shows a diff explaining what had changed between two revisions:
     This fetches previously deployed versions of a release
-  and compares them. This can be used visualize what changes
+  and compares them. This can be used to visualize what changes
   were made during revision change.
 
 * Shows a diff explaining what a helm rollback would change:
     This fetches the currently deployed version of a release
   and compares it to the previously deployed version of the release, that you
-  want to rollback. This can be used visualize what changes a
+  want to rollback. This can be used to visualize what changes a
   helm rollback will perform.
 `
 

cmd/upgrade.go

@@ -109,7 +109,7 @@ const globalUsage = `Show a diff explaining what a helm upgrade would change.
 
 This fetches the currently deployed version of a release
 and compares it to a chart plus values.
-This can be used visualize what changes a helm upgrade will
+This can be used to visualize what changes a helm upgrade will
 perform.
 `