Improves documentation

Author: raphaelstolt

README.md

@@ -179,8 +179,8 @@ Would expect the following .gitattributes file content:
 The `--report-stale-export-ignores` option extends the validation to look for export-ignore statements referencing non-existent
 repository artifacts. In combination with the `--diff` option these will be shown in the output.
 
-The `--stdin-input` option allows the validate command to read from `STDIN` so that the following can be used for validation.
-It currently only does a strict comparison.
+The `--stdin-input` option allows the validate command to read from `STDIN`, so that the following piped output 
+can be used for validation. It currently only does a strict comparison.
 
 ```bash
 cat .gitattributes | lean-package-validator validate --stdin-input