docs: Remove separation line in TESTING.md .

Author: Charly-sketch

tests/TESTING.md

@@ -12,8 +12,6 @@ Install the required dependencies:
 pip install pytest pyyaml
 ```
 
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 ## Running tests
 
 ### Run mock tests
@@ -24,8 +22,6 @@ python -m pytest tests/ -v -k mock
 
 Executes tests using simulated registers. No hardware is required.
 
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 ### Run hardware tests
 
 ```bash
@@ -34,8 +30,6 @@ python -m pytest tests/ -v --port /dev/ttyACM0
 
 Runs tests on a connected STeaMi board.
 
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 ### Run tests for a specific driver
 
 ```bash
@@ -44,8 +38,6 @@ python -m pytest tests/ -v --driver hts221 --port /dev/ttyACM0
 
 Limits execution to a single driver.
 
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 ### Run interactive tests
 
 ```bash