feat: more web formats supported

[Johnson-zs]

.htm dhtml .xhtml .shtm .shtml

Log: as title

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在docparser.cpp文件中，isTextSuffix函数中的validSuffixes集合被修改，增加了"htm"和"dhtml"等后缀，但是没有提供修改的理由或背景。需要确认这些新后缀是否与产品功能和需求相符。
• 检查是否有对应的单元测试来验证"htm"和"dhtml"等新后缀的功能和兼容性。

是否建议立即修改:

• 是，如果新增的后缀"htm"和"dhtml"等与产品功能不符，或者没有进行充分的测试，那么应该立即进行修正。同时，建议提供详细的代码注释，解释为什么需要这些新增的后缀，以及它们是如何影响产品功能的。

[github-actions]

TAG Bot

TAG: 1.0.11
EXISTED: no
DISTRIBUTION: unstable

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Johnson-zs, max-lvs

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