doc: Update coverage related documentation

docs/markdown/Feature-autodetection.md

@@ -16,4 +16,4 @@ If you do not wish to use CCache for some reason, just specify your compiler wit
 Coverage
 --
 
-When doing a code coverage build, Meson will check the existence of binaries `gcovr`, `lcov` and `genhtml`. If the first one is found, it will create targets called *coverage-text* and *coverage-xml*. If the latter two or a new enough `gcovr` is found, it generates the target *coverage-html*. You can then generate coverage reports just by calling e.g. `ninja coverage-xml`.
+When doing a code coverage build, Meson will check for existence of the binaries `gcovr`, `lcov` and `genhtml`. If version 3.3 or higher of the first is found, targets called *coverage-text*, *coverage-xml* and *coverage-html* are generated. Alternatively, if the latter two are found, only the target *coverage-html* is generated. Coverage reports can then be produced simply by calling e.g. `ninja coverage-xml`. As a convenience, a high-level *coverage* target is also generated which will produce all 3 coverage report types, if possible.

docs/markdown/Unit-tests.md

@@ -30,7 +30,7 @@ Note how you need to specify multiple values as an array.
 Coverage
 --
 
-If you enable coverage measurements by giving Meson the command line flag `-Db_coverage=true`, you can generate coverage reports. Meson will autodetect what coverage generator tools you have installed and will generate the corresponding targets. These targets are `coverage-xml` and `coverage-text` which are both provided by [Gcovr](http://gcovr.com) and `coverage-html`, which requires [Lcov](https://ltp.sourceforge.io/coverage/lcov.php) and [GenHTML](https://linux.die.net/man/1/genhtml) or [Gcovr](http://gcovr.com) with html support.
+If you enable coverage measurements by giving Meson the command line flag `-Db_coverage=true`, you can generate coverage reports. Meson will autodetect what coverage generator tools you have installed and will generate the corresponding targets. These targets are `coverage-xml` and `coverage-text` which are both provided by [Gcovr](http://gcovr.com) (version 3.3 or higher) and `coverage-html`, which requires [Lcov](https://ltp.sourceforge.io/coverage/lcov.php) and [GenHTML](https://linux.die.net/man/1/genhtml) or [Gcovr](http://gcovr.com). As a convenience, a high-level `coverage` target is also generated which will produce all 3 coverage report types, if possible.
 
 The output of these commands is written to the log directory `meson-logs` in your build directory.