[DOCS] salt.modules.saltcheck has duplicate examples and a confusing definition

[M3GH4NN]

Description

1. Duplicate examples. "EXAMPLE WITH JINJA" and "EXAMPLE WITH SETUP STATE INCLUDING PILLAR".
2. Clarification needed for assertion definition:

assertion:
(str) One of the supported assertions and required except for saltcheck.state_apply Tests which fail the assertion and expected_return, cause saltcheck to exit which a non-zero exit code.

This sentence is confusing and I have a hard time understanding what it means.

Suggested Fix
Duplicate examples are confusing and the definition for assertion is extremely confusing

Type of documentation
salt.modules.saltcheck

Location or format of documentation
saltcheck examples
assertion definition

Additional context
Add any other context or screenshots about the feature request here.

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