chore(.cz-config.js, README.md): clearify commit scopes

#30

.cz-config.js

 module.exports = {
   types: [
-    { value: 'PATCH', name: 'PATCH:     Small addition to or revision of the Technical Reference' },
-    { value: 'MINOR', name: 'MINOR:     Medium addition to or revision of the Technical Reference' },
-    { value: 'MAJOR', name: 'MAJOR:     Huge contribution to or revision of the Technical Reference' },
+    { value: 'PATCH', name: 'PATCH:     Small addition to or revision of the TR\'s Markdown files' },
+    { value: 'MINOR', name: 'MINOR:     Medium addition to or revision of the TR\'s Markdown files' },
+    { value: 'MAJOR', name: 'MAJOR:     Huge contribution to or revision of the TR\'s Markdown files' },
     { value: 'feat', name: 'feat:     A new feature' },
     { value: 'fix', name: 'fix:      A bug fix' },
     { value: 'docs', name: 'docs:     General documentation-only changes' },

README.md

@@ -12,7 +12,7 @@ Originally based on the [EURISE Network Technical Reference](https://github.com/
 
 ## Contributing
 
-Commits have to be made following a certain convention that is defined by the [Conventional Commit](https://www.conventionalcommits.org/en/v1.0.0/) standard. This repo is designed to be used with [Commitizen](https://github.com/commitizen/cz-cli) for which we provide a configuration in `package.json`.
+Commits have to be made following a certain convention that is defined by the[Conventional Commit](https://www.conventionalcommits.org/en/v1.0.0/) standard. This repo is designed to be used with [Commitizen](https://github.com/commitizen/cz-cli) for which we provide a configuration in `package.json`.
 
 Install it with
 
@@ -31,6 +31,6 @@ exec < /dev/tty && node_modules/.bin/git-cz --hook || true
 
 We have configured three types of commits for the work on the technical reference that should reflect the extent of your contribution:
 
-- PATCH:     Small addition to or revision of Technical reference.
-- MINOR:     Medium addition to or revision of Technical reference.
-- MAJOR:     Huge contribution to or revision of Technical reference.
+- PATCH:     Small addition to or revision of Technical reference's Markdown files.
+- MINOR:     Medium addition to or revision of Technical reference's Markdown files.
+- MAJOR:     Huge contribution to or revision of Technical reference's Markdown files.