Fix typo in Observer.

Author: munificent

book/observer.markdown

@@ -615,7 +615,7 @@ the program, don't use the Observer pattern to express that linkage. Prefer
 something more explicit.
 
 When you're hacking on some big program, you tend to have lumps of it that you
-work on all together. We've lots of terminology for this like "separation of
+work on all together. We have lots of terminology for this like "separation of
 concerns" and "coherence and cohesion" and "modularity", but it boils down to
 "this stuff goes together and doesn't go with this other stuff".
 

html/double-buffer.html

@@ -398,7 +398,7 @@ <h3><a href="#artificial-unintelligence" name="artificial-unintelligence">Artifi
 </aside>
 
 <p>Actors can also interact with each other, if by &#8220;interacting&#8221;, we mean &#8220;they can
-slap each other around.&#8221; When updating, the actor can call <code>slap()</code> on another
+slap each other around&#8221;. When updating, the actor can call <code>slap()</code> on another
 actor to slap it and call <code>wasSlapped()</code> to determine if it has been slapped.</p>
 <p>The actors need a stage where they can interact, so let&#8217;s build that:</p>
 <div class="codehilite"><pre><span class="k">class</span> <span class="nc">Stage</span>

html/introduction.html

@@ -50,7 +50,7 @@ <h1 class="book"><a href="/">Game Programming Patterns</a></h1>
 <p>At the back of the stack of pages was a real monster: a program that took up
 several dense pages of code. It took a while before we worked up the courage
 to even try it, but it was irresistible&#8202;&mdash;&#8202;the title above the listing was
-&#8220;Tunnels and Trolls.&#8221; We had no idea what it did, but it sounded like a game,
+&#8220;Tunnels and Trolls&#8221;. We had no idea what it did, but it sounded like a game,
 and what could be cooler than a computer game that you programmed yourself?</p>
 <p>We never did get it running, and after a year, we moved out of that classroom.
 (Much later when I actually knew a bit of BASIC, I realized that it was just a
@@ -70,7 +70,7 @@ <h1 class="book"><a href="/">Game Programming Patterns</a></h1>
 
 <p>At first, the challenge was just getting something on screen. Then, it became
 figuring out how to write programs bigger than what would fit in my head. Instead
-of just reading about &#8220;How to Program in C++,&#8221; I started trying to find books
+of just reading about &#8220;How to Program in C++&#8221;, I started trying to find books
 about how to <em>organize</em> programs.</p>
 <p>Fast-forward several years, and a <span name="friend">friend</span> hands me a
 book: <em>Design Patterns: Elements of Reusable Object-Oriented Software</em>.
@@ -172,7 +172,7 @@ <h2><a href="#how-it-relates-to-design-patterns" name="how-it-relates-to-design-
 attempt to do that for software.</p>
 </aside>
 
-<p>By calling this book &#8220;Game Programming Patterns,&#8221; I&#8217;m not trying to imply that
+<p>By calling this book &#8220;Game Programming Patterns&#8221;, I&#8217;m not trying to imply that
 the Gang of Four&#8217;s book is <span name="nongames">inapplicable</span> to games.
 On the contrary: the <a href="design-patterns-revisited.html">Design Patterns Revisited</a>
 section of this book covers many of the patterns from <em>Design

html/observer.html

@@ -671,7 +671,7 @@ <h3><a href="#what's-going-on" name="what's-going-on">What&#8217;s going on?</a>
 the program, don&#8217;t use the Observer pattern to express that linkage. Prefer
 something more explicit.</p>
 <p>When you&#8217;re hacking on some big program, you tend to have lumps of it that you
-work on all together. We&#8217;ve lots of terminology for this like &#8220;separation of
+work on all together. We have lots of terminology for this like &#8220;separation of
 concerns&#8221; and &#8220;coherence and cohesion&#8221; and &#8220;modularity&#8221;, but it boils down to
 &#8220;this stuff goes together and doesn&#8217;t go with this other stuff&#8221;.</p>
 <p>The observer pattern is a great way to let those mostly unrelated lumps talk to

html/subclass-sandbox.html

@@ -338,7 +338,7 @@ <h3><a href="#what-operations-should-be-provided" name="what-operations-should-b
 <aside name="include">
 
 <p>Concretely, this means each source file for a subclass would only need a single
-<code>#include</code>: the one for its base class.</p>
+<code>#include</code>&#8202;&mdash;&#8202;the one for its base class.</p>
 </aside>
 
 <p>Between these two points, there&#8217;s a wide middle ground where some operations are