[IMP] skip toctree in check_early_line_breaks

[nikibrown]

Task: https://www.odoo.com/odoo/project/3835/tasks/6065752

Issue:
Make review is showing early line break errors within toctrees:

Solution:
Update check_early_line_breaks function to skip checking for early returns in a toctree.

Testing:
Run make review on a file that has a toctree at the bottom. For example: content/applications/marketing/events.rst

Expected output should be No problems found.

[robodoo]

[Felicious]

Tests

Same test as Niki, on the events app page

running make review on applications/marketing/events.rst on the 17.0 branch:

running make review on this feature branch:

Testing productivity folder (applications/productivity.rst)

On 17.0 (failure case)

On feature branch (pass case)

Test child folder of an app page (applications/inventory_and_mrp/inventory/product_management.rst)

On 17.0 (failure case)

On feature branch (pass case)

[Felicious]

Works great with my testing! Thanks @nikibrown (:

[AntoineVDV]

@robodoo r+