[bug] Incorrect separator line direction in AND gate ASCII diagram

## Where - Phase 3/ lesson1: The Perceptron - File / URL: phases\03-deep-learning-core\01-the-perceptron\docs\en.md ## What's wrong In the ASCII diagram illustrating linear separability for the AND gate, the separating line is drawn as `/` (bottom-left to top-right), Should it be `\` (top-left to bottom-right) to correctly isolate the (1,1) point from the three 0s?