Resolving typo's in the doc site. (part 1)

## Bug Report

### Steps to Reproduce:
1. ...step 1 description...
2. ...step 2 description...
3. ...step 3 description...

### Expected Result:
...description of what you expected to see...

### Actual Result:
...what actually happened, including full exceptions (please include the entire stack trace, including "caused by" entries), log entries, screen shots etc. where appropriate...

### Environment:
...version and build of the project, OS and runtime versions, virtualised environment (if any), etc. ...

### Additional Context:
...add any other context about the problem here. If applicable, add screenshots to help explain...