Rollup merge of #23329 - jbcrail:rm-syntax-highlight, r=sanxiyn

As suggested by @steveklabnik in #23254, I removed the redundant Rust syntax highlighting from the documentation.

src/libstd/os.rs

@@ -132,7 +132,7 @@ pub const TMPBUF_SZ : uint = 1000;
 ///
 /// # Examples
 ///
-/// ```rust
+/// ```
 /// use std::os;
 ///
 /// // We assume that we are in a valid directory.
@@ -152,7 +152,7 @@ pub fn getcwd() -> IoResult<Path> {
 ///
 /// # Examples
 ///
-/// ```rust
+/// ```
 /// use std::os;
 ///
 /// // We will iterate through the references to the element returned by os::env();
@@ -188,7 +188,7 @@ pub fn env_as_bytes() -> Vec<(Vec<u8>, Vec<u8>)> {
 ///
 /// # Examples
 ///
-/// ```rust
+/// ```
 /// use std::os;
 ///
 /// let key = "HOME";
@@ -230,7 +230,7 @@ fn byteify(s: OsString) -> Vec<u8> {
 ///
 /// # Examples
 ///
-/// ```rust
+/// ```
 /// use std::os;
 ///
 /// let key = "KEY";
@@ -270,7 +270,8 @@ pub fn unsetenv(n: &str) {
 /// environment variable.
 ///
 /// # Examples
-/// ```rust
+///
+/// ```
 /// use std::os;
 ///
 /// let key = "PATH";
@@ -302,7 +303,7 @@ pub fn split_paths<T: BytesContainer>(unparsed: T) -> Vec<Path> {
 ///
 /// # Examples
 ///
-/// ```rust
+/// ```
 /// use std::os;
 /// use std::old_path::Path;
 ///
@@ -363,7 +364,7 @@ pub fn dll_filename(base: &str) -> String {
 ///
 /// # Examples
 ///
-/// ```rust
+/// ```
 /// use std::os;
 ///
 /// match os::self_exe_name() {
@@ -383,7 +384,7 @@ pub fn self_exe_name() -> Option<Path> {
 ///
 /// # Examples
 ///
-/// ```rust
+/// ```
 /// use std::os;
 ///
 /// match os::self_exe_path() {
@@ -412,7 +413,7 @@ pub fn self_exe_path() -> Option<Path> {
 ///
 /// # Examples
 ///
-/// ```rust
+/// ```
 /// use std::os;
 ///
 /// match os::homedir() {
@@ -501,7 +502,8 @@ pub fn tmpdir() -> Path {
 /// as is.
 ///
 /// # Examples
-/// ```rust
+///
+/// ```
 /// use std::os;
 /// use std::old_path::Path;
 ///
@@ -532,7 +534,8 @@ pub fn make_absolute(p: &Path) -> IoResult<Path> {
 /// whether the change was completed successfully or not.
 ///
 /// # Examples
-/// ```rust
+///
+/// ```
 /// use std::os;
 /// use std::old_path::Path;
 ///
@@ -553,7 +556,8 @@ pub fn errno() -> i32 {
 /// Return the string corresponding to an `errno()` value of `errnum`.
 ///
 /// # Examples
-/// ```rust
+///
+/// ```
 /// use std::os;
 ///
 /// // Same as println!("{}", last_os_error());
@@ -749,7 +753,7 @@ extern "system" {
 /// See `String::from_utf8_lossy` for details.
 /// # Examples
 ///
-/// ```rust
+/// ```
 /// use std::os;
 ///
 /// // Prints each argument on a separate line