Add errata for page 397 (BIP148 error), and page 399 (missing bold)

notes/errata.html

@@ -47,13 +47,24 @@ <h2>Chapter 10, page 362</h2>
     <p>The figure after Figure 10.34, is labeled as "Figure 10.3",
       when it should be labeled as "Figure 10.35"</p>
 
+    <h2>Chapter 11, page 397</h2>
+    <p>The third paragraph, which discusses the risks involved in
+    BIP148, says "It could cause a chain split if a majority of the
+    hash rate didn't signal for segwit.". This is misleading. Instead
+    it should say "It will cause a chain split if a miner publishes a
+    non-segwit-signalling block.". Thanks to Sjors Provoost for
+    pointing this out.</p>
+
+    <h2>Chapter 11, page 399</h2>
+    <p>The bold paragraph contains the word "follow" in italic but not
+    bold. The word should be both italic and bold.</p>
+
     <h2>Appendix A, page 418</h2>
     <p>The paragraph right after the bullet list contains "I've" and
       "don't" with straight apostrophes. They should use curly
       apostrophe, as in "<strong>I’ve</strong>" and
       "<strong>don’t</strong>"</p>
-
-    <h2>Appendix A, page 418</h2>
+    <br/>
     <p>The paragraph right after the bullet list ends with '.:', it
       should end with just '.'</p>