Update the CONTRIBUTING.md

[gkwan-ibm]

The CONTRIBUTING.md is still using qa. It should be updated to staging

[gkwan-ibm]

update the CONTRIBUTING.md of the following guides as same s https://raw.githubusercontent.com/OpenLiberty/guide-openliberty-operator-intro/prod/CONTRIBUTING.md

• guide-gradle-intro
• guide-rest-intro
• guide-maven-intro
• guide-social-media-login
• guides-common
• guide-cloud-openshift
• guide-microprofile-opentracing-jaeger
• guide-bean-validation
• guide-security-intro
• guide-cloud-openshift-operator
• guide-jpa-intro
• guide-microprofile-graphql
• guide-getting-started
• guide-microprofile-opentracing
• guide-rest-hateoas
• guide-rest-client-java
• guide-microprofile-fallback
• guide-rest-client-angular
• guide-microprofile-reactive-messaging-acknowledgment
• guide-reactive-rest-client
• guide-microprofile-reactive-messaging-rest-integration
• guide-containerize
• guide-cloud-google
• guide-microprofile-rest-client
• guide-microprofile-reactive-messaging
• guide-maven-multimodules
• guide-cloud-ibm
• guide-kubernetes-intro
• guide-microprofile-metrics
• guide-microprofile-config
• guide-microshed-testing
• guide-kubernetes-microprofile-config
• guide-microprofile-rest-client-async
• guide-reactive-messaging-sse
• guide-cloud-aws
• guide-contract-testing
• guide-docker
• guide-okd
• guide-istio-intro
• guide-microprofile-openapi
• guide-microprofile-jwt
• guide-reactive-service-testing
• guide-microprofile-istio-retry-fallback
• guide-cdi-intro
• guide-cors
• guide-kubernetes-microprofile-health
• guide-spring-boot
• guide-microprofile-health
• guide-mongodb-intro

[gkwan-ibm]

Unto now, the following guides either has no PR or PR is not good enough

• guide-social-media-login
• guides-common
• guide-cloud-openshift-operator
• guide-rest-client-angularjs
• guide-sessions
• guide-arquillian-managed
• guide-rest-client-reactjs
• guide-cloud-aws
• guide-microprofile-jwt

[gkwan-ibm]

close

• all above guides were updated