Rename new ruff rule output format to "pretty"

The new `ruff rule` output format introduced in
551b810aeb doesn't print Markdown but
rather some rich text with escape sequences for colors and links,
it's actually the "text" format that prints Markdown, so naming the new
format "markdown" is very confusing. This commit therefore renames it to
"pretty".

This isn't a breaking change since there hasn't been a release yet.

crates/ruff_cli/src/args.rs

@@ -41,7 +41,7 @@ pub enum Command {
         rule: Rule,
 
         /// Output format
-        #[arg(long, value_enum, default_value = "markdown")]
+        #[arg(long, value_enum, default_value = "pretty")]
         format: HelpFormat,
     },
     /// List all supported upstream linters
@@ -284,7 +284,7 @@ pub struct CheckArgs {
 pub enum HelpFormat {
     Text,
     Json,
-    Markdown,
+    Pretty,
 }
 
 #[allow(clippy::module_name_repetitions)]

crates/ruff_cli/src/commands/linter.rs

@@ -64,7 +64,7 @@ pub fn linter(format: HelpFormat) -> Result<()> {
             output.push('\n');
         }
 
-        HelpFormat::Markdown => {
+        HelpFormat::Pretty => {
             output.push_str(&format!("| {:>6} | {:<27} |\n", "Prefix", "Name"));
             output.push_str(&format!("| {:>6} | {:<27} |\n", "------", "-".repeat(27)));
 

crates/ruff_cli/src/commands/rule.rs

@@ -27,7 +27,7 @@ pub fn rule(rule: &Rule, format: HelpFormat) -> Result<()> {
     let mut output = String::new();
 
     match format {
-        HelpFormat::Text | HelpFormat::Markdown => {
+        HelpFormat::Text | HelpFormat::Pretty => {
             output.push_str(&format!("# {} ({})", rule.as_ref(), rule.code()));
             output.push('\n');
             output.push('\n');
@@ -69,7 +69,7 @@ pub fn rule(rule: &Rule, format: HelpFormat) -> Result<()> {
         HelpFormat::Json | HelpFormat::Text => {
             writeln!(stdout, "{output}")?;
         }
-        HelpFormat::Markdown => {
+        HelpFormat::Pretty => {
             let parser = Parser::new_ext(
                 &output,
                 Options::ENABLE_TASKLISTS | Options::ENABLE_STRIKETHROUGH,