Remove foxtail references

[carthick]

No description provided.

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[pavoljuhas]

Thank you for the catch. Can you please clean the other Foxtail references as well?

I suggest to delete the Foxtail paragraph here -

Cirq/docs/google/devices.md

Lines 336 to 340 in 3ac3c30

	### Foxtail
	The Foxtail device is a 2 by 11 XMON device arranged in a bilinear array,
	addressable by using grid qubits `({0,1}, {0-11})`. It was one of the first
	super-conducting quantum devices announced by Google. Due to the small number of qubits

and substitute Sycamore at

Cirq/docs/dev/development.md

Line 418 in 3ac3c30

python -c "import cirq; print(cirq_google.Foxtail)"

[carthick]

Thank you for the catch. Can you please clean the other Foxtail references as well?

I suggest to delete the Foxtail paragraph here -

Cirq/docs/google/devices.md

Lines 336 to 340 in 3ac3c30

	### Foxtail
	The Foxtail device is a 2 by 11 XMON device arranged in a bilinear array,
	addressable by using grid qubits `({0,1}, {0-11})`. It was one of the first
	super-conducting quantum devices announced by Google. Due to the small number of qubits

and substitute Sycamore at

Cirq/docs/dev/development.md

Line 418 in 3ac3c30

python -c "import cirq; print(cirq_google.Foxtail)"

Sure @pavoljuhas , I have updated the PR, please let me know if anything need to update.

[wcourtney]

Thanks for the cleanup :-)

[pavoljuhas]

LGTM, thank you!