Update comment for the reason

src/index.ts

@@ -55,12 +55,13 @@ const handleNode =
       // So we just need to addtionally check if the following one is a block.
       // The legacy title variant is not affected since it checks an inline and does not case the newline.
 
-      // No addtional inlines can exist in this paragraph for the title
+      // No addtional inlines can exist in this paragraph for the title...
       if (paragraph.children.length > 1) {
-        // Carriage returns are allowed by GitHub flavored Markdown.
-        // It makes a more coherent rendering in environments were admonitions aren't supported.
-        // When they are, we must strip the unnecessary `<br />` prepended in the first `<p>`.
+        // Unless it is an inline break, which can be transformed to from 2 spaces with a newline.
         if (paragraph.children.at(1)?.type == 'break') {
+          // When it is, we actually have already found the line break required by GitHub.
+          // So we just strip the additional `<br>` element.
+          // The title element will be removed later.
           paragraph.children.splice(1, 1)
         } else {
           return

test/index.spec.ts

@@ -166,6 +166,7 @@ describe('GitHub beta blockquote-based admonitions with titles like [!NOTE]', fu
       '# Admonitions\n' +
       // So that the title isn't put inline with the forecoming text,
       // when no GFM admonitions are available.
+      // These 2 spaces with the newline are transformed into an inline break.
       // ----------vv
       '> [!WARNING]  \n' +
       '> Critical content demanding immediate user attention due to potential risks.\n',