(json PR 206) Fix typo in comment (sing -> sign)

src/number.rs

@@ -42,7 +42,7 @@ pub struct Number {
     // Decimal exponent, analog to `e` notation in string form.
     exponent: i16,
 
-    // Integer base before sing and exponent applied.
+    // Integer base before sign and exponent applied.
     mantissa: u64,
 }
 

tests/json_checker.rs

@@ -154,7 +154,7 @@ mod json_checker_fail {
     }
 
     #[test]
-    fn missmatch() {
+    fn mismatch() {
         assert!(parse(r#"["mismatch"}"#).is_err());
     }
 }

tests/parse.rs

@@ -238,7 +238,7 @@ fn parse_and_index_mut_from_null() {
 
     assert!(data["foo"]["bar"].is_null());
 
-    // test that data didn't coerece to object
+    // test that data didn't coerce to object
     assert!(data.is_null());
 
     data["foo"]["bar"] = 100.into();