Fix cirqdev gitter URL (#6084)

Update URL to the cirqdev Gitter channel and clean up some trailing blanks.

Fixes #6080

README.rst

@@ -100,7 +100,7 @@ We welcome contributions! Before opening your first PR, a good place to start is
 We are dedicated to cultivating an open and inclusive community to build software for near term quantum computers.
 Please read our `code of conduct <https://github.com/quantumlib/cirq/blob/master/CODE_OF_CONDUCT.md>`__ for the rules of engagement within our community.
 
-For real time informal discussions about Cirq, join our `cirqdev <https://gitter.im/cirqdev>`__ Gitter channel, come hangout with us!
+For real time informal discussions about Cirq, join our `cirqdev <https://gitter.im/cirqdev/community>`__ Gitter channel, come hangout with us!
 
 **Cirq Cynque** is our weekly meeting for contributors to discuss upcoming features, designs, issues, community and status of different efforts.
 To get an invitation please join the `cirq-dev email list <https://groups.google.com/forum/#!forum/cirq-dev>`__ which also serves as yet another platform to discuss contributions and design ideas.

docs/dev/support.md

@@ -1,29 +1,29 @@
 # Report an issue or request a feature
 
-| Project | Issue tracker | 
+| Project | Issue tracker |
 |---------|--------------------|
-| Cirq | https://github.com/quantumlib/Cirq/issues | 
-| OpenFermion | https://github.com/quantumlib/OpenFermion/issues | 
+| Cirq | https://github.com/quantumlib/Cirq/issues |
+| OpenFermion | https://github.com/quantumlib/OpenFermion/issues |
 | ReCirq | https://github.com/quantumlib/ReCirq/issues |
-| qsim | https://github.com/quantumlib/qsim/issues | 
+| qsim | https://github.com/quantumlib/qsim/issues |
 | Tensorflow Quantum |https://github.com/tensorflow/quantum/issues |
 
-To report an issue or request a feature in our open-source projects, 
-first check if there is already an open issue for your bug report / 
-feature request at the links above. If not, file an issue by following 
+To report an issue or request a feature in our open-source projects,
+first check if there is already an open issue for your bug report /
+feature request at the links above. If not, file an issue by following
 the provided template and/or contributing guidelines. Thanks for helping
 improve open-source quantum software!
 
 # Questions
 
 If you're not sure whether a certain behavior is buggy, or if you have other questions,
-please ask us in the [Cirq Gitter channel](https://gitter.im/cirqdev). 
+please ask us in the [Cirq Gitter channel](https://gitter.im/cirqdev/community).
 
 # Weekly developer meetings
 
-You may also be interested to join the weekly 
-[Cirq sync](https://groups.google.com/g/cirq-dev/about) with Cirq developers and 
-contributors. There are also weekly syncs for 
+You may also be interested to join the weekly
+[Cirq sync](https://groups.google.com/g/cirq-dev/about) with Cirq developers and
+contributors. There are also weekly syncs for
 [OpenFermion](https://groups.google.com/g/openfermion-dev/about),
 [qsim](https://groups.google.com/g/qsim-qsimh-dev/about), and
 [TensorFlow Quantum](https://groups.google.com/g/tfq-dev/about).