Fix watchQuery link to docs
Fix watchQuery link to docs

The link to the watchQuery API docs is currently broken. Submitted a PR for this fix in `vue-apollo` earlier too: 
Also, replaced the squared brackets around the ‘apollo-client API reference’ text with parenthesis for better readability (IMHO).
apollostack/apollo-client,apollostack/apollo-client,apollographql/apollo-client,apollostack/apollo-client,apollographql/apollo-client