"Does exists" typos fix

library/std/src/fs.rs

@@ -1050,7 +1050,7 @@ impl Metadata {
     ///
     /// fn main() -> std::io::Result<()> {
     ///     let link_path = Path::new("link");
-    ///     symlink("/origin_does_not_exists/", link_path)?;
+    ///     symlink("/origin_does_not_exist/", link_path)?;
     ///
     ///     let metadata = fs::symlink_metadata(link_path)?;
     ///

library/std/src/path.rs

@@ -2806,7 +2806,7 @@ impl Path {
     /// use std::os::unix::fs::symlink;
     ///
     /// let link_path = Path::new("link");
-    /// symlink("/origin_does_not_exists/", link_path).unwrap();
+    /// symlink("/origin_does_not_exist/", link_path).unwrap();
     /// assert_eq!(link_path.is_symlink(), true);
     /// assert_eq!(link_path.exists(), false);
     /// ```

src/bootstrap/bootstrap.py

@@ -863,7 +863,7 @@ def get_toml(self, key, section=None):
         >>> rb.get_toml("key2")
         'value2'
 
-        If the key does not exists, the result is None:
+        If the key does not exist, the result is None:
 
         >>> rb.get_toml("key3") is None
         True

src/bootstrap/bootstrap_test.py

@@ -55,8 +55,8 @@ def setUp(self):
     def tearDown(self):
         rmtree(self.container)
 
-    def test_stamp_path_does_not_exists(self):
-        """Return True when the stamp file does not exists"""
+    def test_stamp_path_does_not_exist(self):
+        """Return True when the stamp file does not exist"""
         if os.path.exists(self.rustc_stamp_path):
             os.unlink(self.rustc_stamp_path)
         self.assertTrue(self.build.program_out_of_date(self.rustc_stamp_path, self.key))