Fixed broken link of 'Circuit Breaker' #166
                
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This pull request fixes a broken link in the REST Service guide. The original link to the “Circuit Breaker” guide pointed to:
https://spring.io/guides/gs/circuit-breaker/
which returned a 404 Not Found error.
⸻
Fix:
The incorrect URL was updated to the correct one:
https://spring.io/guides/gs/cloud-circuit-breaker/
Closes spring-guides/getting-started-guides#169
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