Updated basic debugging

[Felonious-Spellfire]

Updated basic debugging topic

What does this PR do?

Adds missing content about printing the model summary if .fit() is not called.

Fixes #14487

Does your PR introduce any breaking changes? If yes, please list them.

None

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Make sure you had fun coding 🙃

cc @Borda @Felonious-Spellfire @akihironitta

[rohitgr7]

@Felonious-Spellfire you can just write

Fixes #<issue_num_1>
Fixes #<issue_num_2>

in the PR description. This will link the issue to the PR, which will close automatically when it gets merged.