doc: fix typo on variable nname [skip ci]

README.md

@@ -22,7 +22,7 @@ The Maven template uses some global configuration used throughout all jobs.
 | Name                  | description                            | default value     |
 | --------------------- | -------------------------------------- | ----------------- |
 | `MAVEN_IMAGE`         | The Docker image used to run Maven <br/>:warning: **set the version required by your project** | `maven:latest` |
-| AVEN_PROJECT_DIR`     | Maven projet root directory | `.` |
+| `MAVEN_PROJECT_DIR`   | Maven projet root directory | `.` |
 | `MAVEN_CFG_DIR`       | The Maven configuration directory      | `.m2`             |
 | `MAVEN_OPTS`          | [Global Maven options](http://maven.apache.org/configure.html#maven_opts-environment-variable) | `-Dhttps.protocols=TLSv1.2 -Dmaven.repo.local=${MAVEN_CFG_DIR}/repository -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=WARN -Dorg.slf4j.simpleLogger.showDateTime=true -Djava.awt.headless=true` |
 | `MAVEN_CLI_OPTS`      | Additional [Maven options](https://maven.apache.org/ref/3-LATEST/maven-embedder/cli.html) used on the command line | `--batch-mode --errors --fail-at-end --show-version -DinstallAtEnd=true -DdeployAtEnd=true` |