Text formulation improvements

Co-authored-by: Nicola Soranzo <[email protected]>

CONTRIBUTING.md

@@ -66,8 +66,7 @@ assistance).
 * Continuous integration tests must pass: 
     * The tests must pass (`planemo test --install_galaxy my_tool.xml`)
     * The tools must pass linting by planemo (`planemo lint my_tool.xml`)
-    * Eventlually existing python or R scripts must past linting with `flake8` and `lintr`, respectively
+    * Any Python or R script must pass linting with `flake8` and `lintr`, respectively
 * If there's a relevant paper for the tool, it should be cited in a [citation](https://docs.galaxyproject.org/en/latest/dev/schema.html#tool-citations) block
 * The tool must be licensed to allow use by anyone. The OSI maintains a [list of appropriate](https://opensource.org/licenses/alphabetical) licenses
-* At least one approval to the PR
-
+* At least one approving review by an IUC member