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functions.md doc refinement

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Removed named capture group example in label_replace

Signed-off-by: Guillaume Berche <guillaume.berche@orange.com>
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@ -294,11 +294,10 @@ matches, the value of the label `dst_label` in the returned timeseries will be t
of `replacement`, together with the original labels in the input. Capturing groups in the of `replacement`, together with the original labels in the input. Capturing groups in the
regular expression can be referenced with `$1`, `$2`, etc. Named capturing groups in the regular expression can be referenced with `$name` (where `name` is the capturing group name). If the regular expression doesn't match then the timeseries is returned unchanged. regular expression can be referenced with `$1`, `$2`, etc. Named capturing groups in the regular expression can be referenced with `$name` (where `name` is the capturing group name). If the regular expression doesn't match then the timeseries is returned unchanged.
These two examples will both return timeseries with the values `a:c` at label `service` and `a` at label `foo`: This example will return timeseries with the values `a:c` at label `service` and `a` at label `foo`:
``` ```
label_replace(up{job="api-server",service="a:c"}, "foo", "$1", "service", "(.*):.*") label_replace(up{job="api-server",service="a:c"}, "foo", "$1", "service", "(.*):.*")
label_replace(up{job="api-server",service="a:c"}, "foo", "$name", "service", "(?P<name>.*):(?P<version>.*)")
``` ```
## `ln()` ## `ln()`