Minor grammar changes for SQL page.

Made mostly stylistic changes.

Small grammar updates to the high availability and load balancing page within clusters.

Small grammar updates to cluster operations.

Small grammar changes to the Cluster Deployment page

Small grammar edits on Clustering page

There was an odd sentence in this doc, I updated it to reflect what is written in the Chinese version.

Grammar updates to Data Subscription page.

Grammar updates to the Continuous Query page

Grammar updates to Developer Guide > Select Data

Small grammar updates.

Some grammar updates to Inserting Data > SQL

Small grammar edits.

Made some grammar and reworded the differences between connectors.

Made grammar changes to the Data Model page.

Seems like previous PR was overwritten and reverted to original.

* docs: fix picture links

* fix: broken links