Improve wording in episode 4

[alex-ball]

This PR makes the following changes to the end of episode 4:

• Makes internal URL relative.
• Removes redundant and misspelled word "practicising".
• Slightly changes phrases for improved readability.

[github-actions]

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 md5sum.txt   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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⏱️ Updated at 2025-11-18 15:36:36 +0000