Fix command to run WordCount example on direct runner

[wikier]

To prevent classpath issues, because direct runner is not in the default profile (that could be a different path):

[WARNING] 
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: No Runner was specified and the DirectRunner was not found on the classpath.
Specify a runner by either:
    Explicitly specifying a runner by providing the 'runner' property
    Adding the DirectRunner to the classpath
    Calling 'PipelineOptions.setRunner(PipelineRunner)' directly
	at org.apache.beam.sdk.options.PipelineOptions$DirectRunner.create(PipelineOptions.java:286)
	at org.apache.beam.sdk.options.PipelineOptions$DirectRunner.create(PipelineOptions.java:276)
	at org.apache.beam.sdk.options.ProxyInvocationHandler.returnDefaultHelper(ProxyInvocationHandler.java:575)
	at org.apache.beam.sdk.options.ProxyInvocationHandler.getDefault(ProxyInvocationHandler.java:516)
	at org.apache.beam.sdk.options.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:155)
	at org.apache.beam.sdk.options.PipelineOptionsValidator.validate(PipelineOptionsValidator.java:70)
	at org.apache.beam.sdk.options.PipelineOptionsFactory$Builder.as(PipelineOptionsFactory.java:304)
	at io.redlink.datacamp.beam.WordCount.main(WordCount.java:174)
	... 6 more
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------

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[asfbot]

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[davorbonaci]

LGTM. Merging.

[davorbonaci]

Oh, actually, the PR is modifying the content/ directory. This is automatically generated from src/. So, an equivalent change should be made in src/ and content will automatically update.

Sorry about that.

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[wikier]

Ok, sorry @davorbonaci, I guess I got confused with having the generated site also in the code repository.

Anyway, ea3241e properly addresses what I wanted to patch.

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[davorbonaci]

LGTM. Merging.