docs(html_formatter): simplify tag lowercasing documentation

Simplify and improve documentation for tag lowercasing logic:
- Remove redundant file source enumeration from HtmlFormatOptions
- Streamline should_lowercase_html_tag documentation
- Fix backtick formatting for consistency

Author: matanshavit

crates/biome_html_formatter/src/context.rs

@@ -11,7 +11,7 @@ use crate::comments::{FormatHtmlComment, HtmlCommentStyle, HtmlComments};
 
 #[derive(Debug, Clone)]
 pub struct HtmlFormatOptions {
-    /// The file source (HTML, Svelte, Astro, or Vue).
+    /// The file source.
     file_source: HtmlFileSource,
 
     /// The indent style.

crates/biome_html_formatter/src/utils/metadata.rs

@@ -726,11 +726,8 @@ pub(crate) fn is_canonical_html_tag(tag_name: &HtmlTagName) -> bool {
 
 /// Whether a tag should be lowercased in the current formatting context.
 ///
-/// Returns true only for canonical HTML tags in pure HTML files (.html).
-/// Component frameworks (Svelte, Astro, Vue) preserve tag name casing.
-///
-/// This combines file source checking with canonicality checking to provide
-/// a single decision point for tag lowercasing behavior.
+/// Returns `true` only for canonical HTML tags in pure HTML files (.html).
+/// Component frameworks preserve tag name casing.
 pub(crate) fn should_lowercase_html_tag(f: &HtmlFormatter, tag_name: &HtmlTagName) -> bool {
     f.options().file_source().is_html() && is_canonical_html_tag(tag_name)
 }