Improved the help text of the formatter flag in the run command

[lonnblad]

[codecov]

Codecov Report

Merging #347 into master will decrease coverage by 0.66%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #347      +/-   ##
==========================================
- Coverage   79.78%   79.11%   -0.67%     
==========================================
  Files          30       25       -5     
  Lines        2523     1992     -531     
==========================================
- Hits         2013     1576     -437     
+ Misses        395      320      -75     
+ Partials      115       96      -19     

Impacted Files	Coverage Δ
internal/flags/flags.go	100.00% <100.00%> (ø)
...xamples/db/vendor/github.com/cucumber/godog/fmt.go
...mples/db/vendor/github.com/cucumber/godog/suite.go
...b/vendor/github.com/cucumber/godog/test_context.go
...xamples/db/vendor/github.com/cucumber/godog/run.go
.../db/vendor/github.com/cucumber/godog/stacktrace.go

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