Change librustdoc write(.. \n) to writeln(..); fix comment in grammar

More grammar

src/librustdoc/html/highlight.rs

@@ -46,7 +46,7 @@
 }
 
 fn write_header(out: &mut Buffer, class: Option<&str>) {
-    write!(out, "<div class=\"example-wrap\"><pre class=\"rust {}\">\n", class.unwrap_or_default());
+    writeln!(out, "<div class=\"example-wrap\"><pre class=\"rust {}\">", class.unwrap_or_default());
 }
 
 fn write_code(out: &mut Buffer, src: &str, edition: Edition) {
@@ -62,7 +62,7 @@ fn write_code(out: &mut Buffer, src: &str, edition: Edition) {
 }
 
 fn write_footer(out: &mut Buffer, playground_button: Option<&str>) {
-    write!(out, "</pre>{}</div>\n", playground_button.unwrap_or_default());
+    writeln!(out, "</pre>{}</div>", playground_button.unwrap_or_default());
 }
 
 /// How a span of text is classified. Mostly corresponds to token kinds.

src/librustdoc/html/render/mod.rs

@@ -964,7 +964,7 @@ fn attributes(it: &clean::Item) -> Vec<String> {
 // a whitespace prefix and newline.
 fn render_attributes_in_pre(w: &mut Buffer, it: &clean::Item, prefix: &str) {
     for a in attributes(it) {
-        write!(w, "{}{}\n", prefix, a);
+        writeln!(w, "{}{}", prefix, a);
     }
 }
 

src/librustdoc/html/sources.rs

@@ -177,7 +177,7 @@ fn print_src(buf: &mut Buffer, s: &str, edition: Edition) {
     }
     buf.write_str("<pre class=\"line-numbers\">");
     for i in 1..=lines {
-        write!(buf, "<span id=\"{0}\">{0:1$}</span>\n", i, cols);
+        writeln!(buf, "<span id=\"{0}\">{0:1$}</span>", i, cols);
     }
     buf.write_str("</pre>");
     highlight::render_with_highlighting(s, buf, None, None, None, edition);

src/librustdoc/theme.rs

@@ -17,7 +17,7 @@
 // This PartialEq implementation IS NOT COMMUTATIVE!!!
 //
 // The order is very important: the second object must have all first's rules.
-// However, the first doesn't require to have all second's rules.
+// However, the first is not required to have all of the second's rules.
 impl PartialEq for CssPath {
     fn eq(&self, other: &CssPath) -> bool {
         if self.name != other.name {