Rollup merge of rust-lang#62239 - lcolaholicl:lcolaholicl-patch-1, r=kennytm

Fix a typo

The definition of 京 seems to be capital, but not capitol.
[reference](https://en.wiktionary.org/wiki/%E4%BA%AC#Etymology_1)
[another reference](https://jisho.org/word/%E4%BA%AC)

Author: Centril

src/libcore/char/methods.rs

@@ -337,16 +337,16 @@ impl char {
     /// ```
     /// // as chars
     /// let eastern = '東';
-    /// let capitol = '京';
+    /// let capital = '京';
     ///
     /// // both can be represented as three bytes
     /// assert_eq!(3, eastern.len_utf8());
-    /// assert_eq!(3, capitol.len_utf8());
+    /// assert_eq!(3, capital.len_utf8());
     ///
     /// // as a &str, these two are encoded in UTF-8
     /// let tokyo = "東京";
     ///
-    /// let len = eastern.len_utf8() + capitol.len_utf8();
+    /// let len = eastern.len_utf8() + capital.len_utf8();
     ///
     /// // we can see that they take six bytes total...
     /// assert_eq!(6, tokyo.len());