doc: add make help

README.md

@@ -18,26 +18,26 @@ Build an RPM package which will install several tools.
 
 A `Makefile` is integrated to let you run some basic commands.
 
-- To display some information about the project
+- Display some information about the project
   ```shell
+  make help
   make name
   make version
   make release
-  make build_arch
+  make arch
   ```
 
-- To build a tarball:
+- Build a tarball:
   ```shell
   make tarball 
   ```
   
-- To build a rpm package:
+- Build an rpm package:
   ```shell
   rpmbuild -ba netoik-rp.spec
   ```
   
-- To upload rpm package to Gitea repository
-(env vars `GIT_PACKAGES_USERNAME` and `GIT_PACKAGES_TOKEN` needed):
+- Upload rpm package to Gitea repository (env var `PKG_TOKEN` is required):
   ```shell
   make upload
   ```