Minor fixes in codestart doc

docs/src/main/asciidoc/extension-codestart.adoc

@@ -148,7 +148,7 @@ metadata:
     artifact: "io.quarkiverse.aloha:quarkus-aloha:codestarts:jar:${project.version}"
 ----
 
-* Add the readme <<readme-md>> section template in `base/readme.tpl.qute.md`:
+* Add the readme <<readme-md>> section template in `base/README.tpl.qute.md`:
 +
 [source,html]
 ----
@@ -157,11 +157,11 @@ metadata:
 
 * Run `mvn clean install` in the extension root (or just `runtime`).
 
-* Now we can check that the codestart actually works by creating a project consuming our extension:
+* Now we can check that the codestart actually works by creating a project consuming our extension (make sure the snapshot version is correct):
 +
 [source,bash]
 ----
-quarkus create app aloha-app x=io.quarkiverse.aloha:quarkus-aloha:999-SNAPSHOT
+quarkus create app aloha-app -x=io.quarkiverse.aloha:quarkus-aloha:999-SNAPSHOT
 
 ...
 applying codestarts...
@@ -353,7 +353,7 @@ Those templates are able to use data which contains:
 You may add a `README.md` or `README.tpl.qute.md` in the `base` directory, it will be appended to the others.
 So just add the info relative to your extension codestart.
 
-base/readme.tpl.qute.md
+base/README.tpl.qute.md
 [source,html]
 ----
 {#include readme-header /}