remove small tag

Signed-off-by: Masaya Kataoka <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,33 +4,33 @@
 
 ## Abstract
 
-> <small>[required]</small> This section is required, keep it short, clear and to the point.  
+> [Required] This section is required, keep it short, clear and to the point.  
 > Delete this sentence and explain this pull request shortly.  
 
 ## Background
 
-> <small>[optional]</small> If there is no background information that needs explanation (e.g., just a typo correction, etc.), then delete this section.  
+> [Optional] If there is no background information that needs explanation (e.g., just a typo correction, etc.), then delete this section.  
 > Delete this sentence and explain the circumstances that led to this pull request being sent.  
 
 ## Details
 
-> <small>[optional]</small> If there are only differences whose effects are so obvious that no explanation is needed, or if there are no differences in the code (e.g., documentation additions), delete this section.  
+> [Optional] If there are only differences whose effects are so obvious that no explanation is needed, or if there are no differences in the code (e.g., documentation additions), delete this section.  
 > Delete this sentence and describe this pull request.  
 > For example, it is desirable to describe the specifications of added functions, and detailed explanations of bugs that have been fixed.  
 
 ## References
 
-> <small>[optional]</small> If the referenced material does not exist, delete this section.  
+> [Optional] If the referenced material does not exist, delete this section.  
 > Describe any standards, algorithms, books, articles, etc. that you referenced when creating the pull request. If there is any novelty, mention it.  
 
 # Destructive Changes
 
-> <small>[optional]</small> If no destructive change exists, delete this section.  
+> [Optional] If no destructive change exists, delete this section.  
 > Include a description of the changes and a migration guide and send the pull request with a bump major label. (Example : https://github.com/tier4/scenario_simulator_v2/pull/1139)  
 > Otherwise, remove the "Destructive Changes" section and make sure this pull request is labeled `bump minor` or `bump patch`.)  
 
 # Known Limitations
 
-> <small>[optional]</small> If there are no known limitations that you can think of, delete this section. If there are any limitations on the features or fixes added by this pull request, delete this sentence and clearly describe them.
+> [Optional] If there are no known limitations that you can think of, delete this section. If there are any limitations on the features or fixes added by this pull request, delete this sentence and clearly describe them.
 > For example, the lane matching algorithm currently (1/25/2024) employed is unable to match Entity that is heavily tilted with respect to the lane, and it is difficult to throw an exception.  
 > If the developer is aware of the existence of such problems or limitations, describe them in detail. The problems or limitation should be listed as an Issue on GitHub and a link to it should be provided in this section.