update issue number

Author: HTGAzureX1212

library/core/src/char/methods.rs

@@ -76,12 +76,12 @@ impl char {
 
     /// The maximum number of bytes required to [encode](char::encode_utf8) a `char` to
     /// UTF-8 encoding.
-    #[unstable(feature = "char_max_len", issue = "none")]
+    #[unstable(feature = "char_max_len", issue = "121714")]
     pub const MAX_LEN_UTF8: usize = 4;
 
     /// The maximum number of two-byte units required to [encode](char::encode_utf16) a `char`
     /// to UTF-16 encoding.
-    #[unstable(feature = "char_max_len", issue = "none")]
+    #[unstable(feature = "char_max_len", issue = "121714")]
     pub const MAX_LEN_UTF16: usize = 2;
 
     /// `U+FFFD REPLACEMENT CHARACTER` (�) is used in Unicode to represent a

library/core/src/char/mod.rs

@@ -95,12 +95,12 @@ pub const MAX: char = char::MAX;
 
 /// The maximum number of bytes required to [encode](char::encode_utf8) a `char` to
 /// UTF-8 encoding.
-#[unstable(feature = "char_max_len", issue = "none")]
+#[unstable(feature = "char_max_len", issue = "121714")]
 pub const MAX_LEN_UTF8: usize = char::MAX_LEN_UTF8;
 
 /// The maximum number of two-byte units required to [encode](char::encode_utf16) a `char`
 /// to UTF-16 encoding.
-#[unstable(feature = "char_max_len", issue = "none")]
+#[unstable(feature = "char_max_len", issue = "121714")]
 pub const MAX_LEN_UTF16: usize = char::MAX_LEN_UTF16;
 
 /// `U+FFFD REPLACEMENT CHARACTER` (�) is used in Unicode to represent a