"./gradlew :instrumentation:google-http-client-1.19:muzzle" is failing
I figured out there is missing string in between while running:
```
./gradlew help --task muzzle
...
:instrumentation:google-http-client-1.19:javaagent:muzzle
:instrumentation:grails-3.0:javaagent:muzzle
:instrumentation:grizzly-2.0:javaagent:muzzle
:instrumentation:grpc-1.6:javaagent:muzzle
...
```
MODIFY
docs/contributing/muzzle.md
docs/contributing/muzzle.md
@@ -77,13 +77,13 @@ The gradle plugin defines two tasks:
* `muzzle` task runs the runtime muzzle verification against different library versions:
```sh
- ./gradlew :instrumentation:google-http-client-1.19:muzzle
+ ./gradlew :instrumentation:google-http-client-1.19:javaagent:muzzle
```
If a new, incompatible version of the instrumented library is published it fails the build.
* `printMuzzleReferences` task prints all API references in a given module:
```sh
- ./gradlew :instrumentation:google-http-client-1.19:printMuzzleReferences
+ ./gradlew :instrumentation:google-http-client-1.19:javaagent:printMuzzleReferences
```
The muzzle plugin needs to be configured in the module's `.gradle` file.

"./gradlew :instrumentation:google-http-client-1.19:muzzle" is failing (#4043)

I figured out there is missing string in between while running:
```
./gradlew help --task muzzle
...
    :instrumentation:google-http-client-1.19:javaagent:muzzle
     :instrumentation:grails-3.0:javaagent:muzzle
     :instrumentation:grizzly-2.0:javaagent:muzzle
     :instrumentation:grpc-1.6:javaagent:muzzle
...
```