chore: update usage of hilla-spring-boot-starter

[ZheSun88]

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AI Language Review

The changes in the files Vaadin Upgrade Guide are quite comprehensive. Here are some areas needing improvement:

1. Redundancy: In the Hilla section, the sentence "In case you have react views, add hilla-spring-boot-starter to work together with hilla-spring-boot-starter in your build configuration." seems redundant as it repeats hilla-spring-boot-starter. Consider rephrasing to clarify the intended meaning.

2. Clarity: In the Security Configuration Changes section, the sentence "Use instead the [classname]VaadinSecurityConfigurer base class for your security configuration." can be modified to be more clear, like "Instead, use the [classname]VaadinSecurityConfigurer base class for your security configuration."

3. Typographical Consistency: In the section on Themes and Styling, the use of classname is inconsistent. It should consistently be [classname] for annotations throughout the document without switching styles inadvertently.

These adjustments would enhance the clarity and comprehension of the document. Other than these suggestions, the document seems well-structured.