README update

Author: ilg-ul

README-MAINTAINER.md

@@ -132,7 +132,7 @@ but in the version specific release page.
 
 ### Update version in `package.json` to a pre-release
 
-Use a new version, suffixed by `.pre`.
+Use the new version, suffixed by `pre`, like `1.4.19-3.pre`.
 
 ### Update `CHANGELOG.md`
 
@@ -170,9 +170,8 @@ triggered via the VS Code graphical interface, using the
 For Intel macOS, first run the build on the development machine
 (`wksi`, a recent macOS):
 
-Update the build scripts (or clone them at the first use):
-
 ```sh
+# Update the build scripts.
 git -C ~/Work/xpack-dev-tools/m4-xpack.git pull
 
 xpm run install -C ~/Work/xpack-dev-tools/m4-xpack.git
@@ -193,7 +192,7 @@ For a debug build:
 xpm run build-develop-debug --config darwin-x64 -C ~/Work/xpack-dev-tools/m4-xpack.git
 ```
 
-The build takes a few minutes.
+The build takes several minutes to complete.
 
 When functional, push the `xpack-develop` branch to GitHub.