Fix minor code issues found by static analyses

[caendesilva]

No description provided.

[codecov]

Codecov Report

Merging #303 (ad2a8c6) into master (7997b24) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master      #303   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       822       826    +4     
===========================================
  Files             98        98           
  Lines           2055      2062    +7     
===========================================
+ Hits            2055      2062    +7     

Impacted Files	Coverage Δ
packages/framework/src/Application.php	100.00% <ø> (ø)
...ges/framework/src/Commands/HydeValidateCommand.php	100.00% <ø> (ø)
...ages/framework/src/Concerns/HasArticleMetadata.php	100.00% <ø> (ø)
packages/framework/src/Concerns/HasAuthor.php	100.00% <ø> (ø)
...ages/framework/src/Contracts/AbstractBuildTask.php	100.00% <ø> (ø)
packages/framework/src/Models/MarkdownDocument.php	100.00% <ø> (ø)
packages/framework/src/Models/NavItem.php	100.00% <ø> (ø)
...s/framework/src/Models/Pages/DocumentationPage.php	100.00% <ø> (ø)
...ork/src/Models/Parsers/DocumentationPageParser.php	100.00% <ø> (ø)
packages/framework/src/Models/ValidationResult.php	100.00% <ø> (ø)
... and 14 more

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