doc: fix spelling typo of "insignificant"

PR #839

Author: alexwlchan

regex-syntax/src/ast/parse.rs

@@ -202,7 +202,7 @@ impl ParserBuilder {
 
     /// Enable verbose mode in the regular expression.
     ///
-    /// When enabled, verbose mode permits insigificant whitespace in many
+    /// When enabled, verbose mode permits insignificant whitespace in many
     /// places in the regular expression, as well as comments. Comments are
     /// started using `#` and continue until the end of the line.
     ///

regex-syntax/src/parser.rs

@@ -96,7 +96,7 @@ impl ParserBuilder {
 
     /// Enable verbose mode in the regular expression.
     ///
-    /// When enabled, verbose mode permits insigificant whitespace in many
+    /// When enabled, verbose mode permits insignificant whitespace in many
     /// places in the regular expression, as well as comments. Comments are
     /// started using `#` and continue until the end of the line.
     ///