Merge #250

250: Improve the suggestion for test functions r=DJMcNab a=DJMcNab

I haven't fully updated the previous commented out test - I don't know why it was commented out so some clarification would be welcome.

Co-authored-by: Daniel McNab <36049421+djmcnab@users.noreply.github.com>
Co-authored-by: DJMcNab <36049421+djmcnab@users.noreply.github.com>

diff --cc crates/ra_analysis/src/completion/mod.rs
Simple merge

diff --cc crates/ra_analysis/src/completion/reference_completion.rs
Simple merge