Fix spelling in comments

pkgs/markdown/lib/src/block_parser.dart

diff --git a/pkgs/markdown/lib/src/block_parser.dart b/pkgs/markdown/lib/src/block_parser.dart
index b01945f..cdeb1ab 100644
--- a/pkgs/markdown/lib/src/block_parser.dart
+++ b/pkgs/markdown/lib/src/block_parser.dart
@@ -522,7 +522,7 @@
   // * some word characters
   // * either:
   //   * a close bracket, or
-  //   * whitespace followed by not-brackets follwed by a close bracket
+  //   * whitespace followed by not-brackets followed by a close bracket
   // * possible whitespace and the end of the line.
   RegExp get pattern => new RegExp(r'^ {0,3}</?\w+(?:>|\s+[^>]*>)\s*$');
 

pkgs/markdown/lib/src/inline_parser.dart

diff --git a/pkgs/markdown/lib/src/inline_parser.dart b/pkgs/markdown/lib/src/inline_parser.dart
index fe99191..8c42552 100644
--- a/pkgs/markdown/lib/src/inline_parser.dart
+++ b/pkgs/markdown/lib/src/inline_parser.dart
@@ -443,7 +443,7 @@
   // This pattern matches:
   //
   // * a string of backticks (not followed by any more), followed by
-  // * a non-greedy string of anying, including newlines, ending with anything
+  // * a non-greedy string of anything, including newlines, ending with anything
   //   except a backtick, followed by
   // * a string of backticks the same length as the first, not followed by any
   //   more.