DOC: expanded the documentation for modules a bit

src/doc/extension/module.md

@@ -47,7 +47,7 @@ $(document).ready(function() {
     // use a variable starting with `BUILD_MODULE_` to enable your module
     // the build variable has to be enabled in the `build.properties.d/` directory.
     // Otherwise the module will not be activated.
-    if ("${BUILD_MODULE_EXT_BOTTOM_LINE}" === "ENABLED") {
+    if ("${BUILD_MODULE_EXT_FLIGHT_PREVIEW}" === "ENABLED") {
         caosdb_modules.register(ext_flight_preview);
     }
 });
@@ -69,4 +69,15 @@ If you have unittests (and you should), you need to add a line in :
 
 ## Update the changelog
 
-## Create a merge request
+Briefly describe the changes you made to the whole repository in the file called `CHANGELOD.md` in caosdb-webui.
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+
+## Create a merge request
+
+Commit your changes to the repository to a new branch called `f-<custom name>`. `f-` is the shorthand for feature-branch and your custom name should be short, but descriptive, e.g. `f-flight-preview` in this case.
+
+Push your branch upstream using e.g.:
+`git push --set-upstream origin f-flight-preview`
+
+Login to gitlab and navigate to the project caosdb-webui.
+
+There should be a button titled `Create Merge Request`.
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