correct README.md with escapes

containers/docker/README.md

@@ -7,6 +7,6 @@ This Dockerfile allows to create mainly:
 
 In order for the docker build to correctly set the context, so that it can access the directories containing source codes, docker build must be invoked from this directory as:
 
-   > docker build -f Dockerfile ../.. --target <image name>
+   > docker build -f Dockerfile ../.. --target \<image name\>
 
 where `<image name>` is either `np-tmcode` or `np-tmcode-run`. One may also add the docker build option `-t tagname` to specify the `tagname` the built image should have in his/her registry.
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