Update render extension tests

[github-actions[bot]]

Package	Line Rate	Branch Rate	Complexity	Health
LivingDocumentation.Abstractions	100%	100%	6	✔
LivingDocumentation.Analyzer	56%	54%	258	➖
LivingDocumentation.Descriptions	91%	89%	257	✔
LivingDocumentation.Extensions	100%	100%	22	✔
LivingDocumentation.Json	100%	75%	14	✔
LivingDocumentation.RenderExtensions	68%	80%	133	➖
LivingDocumentation.Statements	100%	100%	16	✔
Summary	73% (630 / 862)	72% (404 / 562)	706	➖

[coveralls]

Pull Request Test Coverage Report for Build 1843216367

• 47 of 90 (52.22%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.7%) to 72.612%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/LivingDocumentation.Render/TypeDescriptionListExtensions.cs	31	74	41.89%
<!--	Total:	47	90	52.22%	-->

Totals
Change from base Build 1842066442:	1.7%
Covered Lines:	630
Relevant Lines:	862

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💛 - Coveralls