Update index.adoc

[antbewes]

Without quotes I was getting error on windows:
PS C:\projects\learn\first-camel-integration> mvn camel:run -Dcamel.main.durationMaxMessages=2 -->
[ERROR] Unknown lifecycle phase ".main.durationMaxMessages=2". ...

Description

Target

• I checked that the commit is targeting the correct branch (Camel 4 uses the main branch)

Tracking

• If this is a large change, bug fix, or code improvement, I checked there is a JIRA issue filed for the change (usually before you start working on it).

Apache Camel coding standards and style

• I checked that each commit in the pull request has a meaningful subject line and body.

• I have run mvn clean install -DskipTests locally from root folder and I have committed all auto-generated changes.

[davsclaus]

I think its better to add this as a new example for windows users. Also do you really need to quote both the key and the value, can it not just be "aaa.bbb=123"

[davsclaus]

okay since this is a intro then lets change the run command to not have that extra command that is just a bit confusing. Instead we tell the user that they can exit via ctrl + c as any other Java application.

[davsclaus]

b49d5f2