fix lint checks instruction

Author: brunoerg

testing.adoc

@@ -24,7 +24,7 @@ Or you can run all checks with:
 
 [source,bash]
 ----
-python test/lint/all-lint.py
+cd ./test/lint/test_runner/ && cargo fmt && cargo clippy && cargo run
 ----
 
 NOTE: Previously these checks were shell scripts (`*.sh`), but they have now been migrated to python on master.

tests-overview.adoc

@@ -16,7 +16,7 @@
 |`test/functional/test_runner.py`
 
 |lint checks
-|`test/lint/all-lint.py`
+|See the https://github.com/bitcoin/bitcoin/blob/master/test/lint/README.md#running-locally[documentation^]
 
 |fuzz
 |See the https://github.com/bitcoin/bitcoin/blob/master/doc/fuzzing.md[documentation^]