Docs: rework coverage tools regex examples

An attempt to fix Markdown escaping in coverage regex example for nyc
ended up in a tricky scenario where either the rendered GitLab help page
or the html on docs.gitlab.com showed the regex incorrectly.

To work this around, we replace the Markdown table with a list of the tools
and the sample regular expressions.

doc/ci/pipelines/settings.md

@@ -137,21 +137,19 @@ averaged.
 
 <!-- vale gitlab.Spelling = NO -->
 
-| Coverage Tool                                  | Sample regular expression                     |
-|------------------------------------------------|-----------------------------------------------|
-| Simplecov (Ruby)                               | `\(\d+.\d+\%\) covered`                       |
-| pytest-cov (Python)                            | `^TOTAL.+?(\d+\%)$`                           |
-| Scoverage (Scala)                              | `Statement coverage[A-Za-z\.*]\s*:\s*([^%]+)` |
-| `phpunit --coverage-text --colors=never` (PHP) | `^\s*Lines:\s*\d+.\d+\%`                      |
-| gcovr (C/C++)                                  | `^TOTAL.*\s+(\d+\%)$`                         |
-| `tap --coverage-report=text-summary` (NodeJS)  | `^Statements\s*:\s*([^%]+)`                   |
-| `nyc npm test` (NodeJS)                        | `All files[^|]*\|[^|]*\s+([\d\.]+)`           |
-| excoveralls (Elixir)                           | `\[TOTAL\]\s+(\d+\.\d+)%`                     |
-| `mix test --cover` (Elixir)                    | `\d+.\d+\%\s+\|\s+Total`                      |
-| JaCoCo (Java/Kotlin)                           | `Total.*?([0-9]{1,3})%`                       |
-| `go test -cover` (Go)                          | `coverage: \d+.\d+% of statements`            |
-| .Net (OpenCover)                               | `(Visited Points).*\((.*)\)`                  |
-| .Net (`dotnet test` line coverage)             | `Total\s*\|\s*(\d+\.?\d+)`                    |
+- Simplecov (Ruby). Example: `\(\d+.\d+\%\) covered`.
+- pytest-cov (Python). Example: `^TOTAL.+?(\d+\%)$`.
+- Scoverage (Scala). Example: `Statement coverage[A-Za-z\.*]\s*:\s*([^%]+)`.
+- `phpunit --coverage-text --colors=never` (PHP). Example: `^\s*Lines:\s*\d+.\d+\%`.
+- gcovr (C/C++). Example: `^TOTAL.*\s+(\d+\%)$`.
+- `tap --coverage-report=text-summary` (NodeJS). Example: `^Statements\s*:\s*([^%]+)`.
+- `nyc npm test` (NodeJS). Example: `All files[^|]*\|[^|]*\s+([\d\.]+)`.
+- excoveralls (Elixir). Example: `\[TOTAL\]\s+(\d+\.\d+)%`.
+- `mix test --cover` (Elixir). Example: `\d+.\d+\%\s+\|\s+Total`.
+- JaCoCo (Java/Kotlin). Example: `Total.*?([0-9]{1,3})%`.
+- `go test -cover` (Go). Example: `coverage: \d+.\d+% of statements`.
+- .Net (OpenCover). Example: `(Visited Points).*\((.*)\)`.
+- .Net (`dotnet test` line coverage). Example: `Total\s*\|\s*(\d+\.?\d+)`.
 
 <!-- vale gitlab.Spelling = YES -->