Instant Search: clarify display of spelling correction

### Impacted plugin

Jetpack

### What

The spelling enhancement could be clearer, perhaps more akin to Google's "did you mean..." instead

### How

Currently if you search for a term which doesn't exist, but is similar to a word which does exist it shows "no results" for the non-existent term, then the results for the similar term below. Example:


It is not immediately clear that it is suggesting a similar term, and instead looks like it may be returning two queries at once. This could be improved with some styling and/or wording changes to the spelling enhancement. An example of this would be Google's 'did you mean':


The issue names no file, test, or entry point; begin by tracing Jetpack's spelling-enhancement search result UI. Review the current “no results” and similar-term presentation described in the issue and compare it with the screenshots. Done means the correction is immediately recognizable as a suggestion rather than a second query, with wording or styling that makes this clear.

Written by the indexing model from the issue text.