Fix typo in site/docs/skylark/rules.md
`mergining` -> `merging`
Closes
@@ -929,7 +929,7 @@ We make the following recommendations to reduce complexity:
[`ctx.runfiles`](lib/ctx.html#runfiles). These modes implicitly collect
runfiles across certain hardcoded dependency edges in confusing ways.
Instead, add files using the `files` or `transitive_files` parameters of
- `ctx.runfiles`, or by mergining in runfiles from dependencies with
+ `ctx.runfiles`, or by merging in runfiles from dependencies with
`runfiles = runfiles.merge(dep[DefaultInfo].default_runfiles)`.
* **Avoid** use of the `data_runfiles` and `default_runfiles` of the
