Readme is vague about what the difference between ObsidianSearch and ObsidianQuickSwitch is

### 📚 The doc issue

In the readme under the commands heading, it says two commands, ObsidianSearch and ObsidianQuickSwitch, but the documentation does not say anything in more detail about them. Their descriptions are very similar, so it's unclear to the user what the difference is or why to use one over the other.

### Suggest a potential alternative/fix

A more detailed description of both commands and their functionality.

Open the README and find the commands heading containing ObsidianSearch and ObsidianQuickSwitch. Compare their documented functionality and add distinct descriptions explaining the difference and when to use each. Done means users can understand both commands without consulting other sources.

Written by the indexing model from the issue text.