Fixed misspellings

Fixed misspellings reported at [Bug #16437], for default gems.

Author: nobu

test/rdoc/MarkdownTest_1.0.3/Markdown Documentation - Basics.text

@@ -270,7 +270,7 @@ it easy to use Markdown to write about HTML example code:
     I strongly recommend against using any `<blink>` tags.
 
     I wish SmartyPants used named entities like `&mdash;`
-    instead of decimal-encoded entites like `&#8212;`.
+    instead of decimal-encoded entities like `&#8212;`.
 
 Output:
 
@@ -279,7 +279,7 @@ Output:
 
     <p>I wish SmartyPants used named entities like
     <code>&amp;mdash;</code> instead of decimal-encoded
-    entites like <code>&amp;#8212;</code>.</p>
+    entities like <code>&amp;#8212;</code>.</p>
 
 
 To specify an entire block of pre-formatted code, indent every line of

test/rdoc/test_rdoc_markdown_test.rb

@@ -744,7 +744,7 @@ def test_markdown_documentation_basics
              "I strongly recommend against using any `<blink>` tags.\n",
              "\n",
              "I wish SmartyPants used named entities like `&mdash;`\n",
-             "instead of decimal-encoded entites like `&#8212;`.\n"),
+             "instead of decimal-encoded entities like `&#8212;`.\n"),
 
         para("Output:"),
 
@@ -753,7 +753,7 @@ def test_markdown_documentation_basics
              "\n",
              "<p>I wish SmartyPants used named entities like\n",
              "<code>&amp;mdash;</code> instead of decimal-encoded\n",
-             "entites like <code>&amp;#8212;</code>.</p>\n"),
+             "entities like <code>&amp;#8212;</code>.</p>\n"),
 
         para("To specify an entire block of pre-formatted code, indent every line of\n" +
              "the block by 4 spaces or 1 tab. Just like with code spans, <code>&</code>, <code><</code>,\n" +

test/rdoc/test_rdoc_parser_ruby.rb

@@ -3504,7 +3504,7 @@ def test_scan_block_comment_notflush
   #
   # The previous test assumes that between the =begin/=end blocks that there
   # is only one line, or minima formatting directives. This test tests for
-  # those who use the =begin bloc with longer / more advanced formatting
+  # those who use the =begin block with longer / more advanced formatting
   # within.
   #
   ##