(docs) Typograpical error in docker building documentation.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/jelly/branches/1.X@1809060 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/BUILDING.md b/BUILDING.md
index b6474d4..39f8d62 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -99,9 +99,9 @@
 We begin by checking the container out into a directory of our choosing on our machine. And, we'll want to make sure that we have properly shared the directory with the docker daemon running locally such that we can map a directory into the container. After that we run the following:
 
 ```
-docker run -v /path/to/checked/out/commons/jelly:/root/commons-jelly-1.x commons-jelly-build-env ant <ant targets>
+docker run -v /path/to/checked/out/commons/jelly:/root/commons-jelly-1.X commons-jelly-build-env ant <ant targets>
 ```
 
-assuming that you ran the exact build command from above (naming the container `commons-jelly-build-env`). Once here you will be logged in on the command line in the container as the `root` user with the above installed and your `commons-jelly` directory shared into the directory on the container `/root/commons-jelly-1.x`. From here you can `cd` to that directory and run any of the ant commands you wish in the project.
+assuming that you ran the exact build command from above (naming the container `commons-jelly-build-env`). Once here you will be logged in on the command line in the container as the `root` user with the above installed and your `commons-jelly` directory shared into the directory on the container `/root/commons-jelly-1.X`. From here you can `cd` to that directory and run any of the ant commands you wish in the project.
 
 For more details on running within the container refer to the following email on the development mailing list: http://markmail.org/message/i6lk2zfrcexs3lgq