Remove unnecessary line breaks from examples

This avoids getting into the (fairly complicated) discussion of white
space processing where that's not relevant.

See #18

Overview.bs

@@ -296,9 +296,7 @@ The <dfn element><code>ruby</code></dfn> element</h3>
  to the following:
 
  <pre><code highlight="html">
- &lt;ruby lang=zh-TW>
- 美&lt;rt>ㄇㄟˇ&lt;rtc lang=zh-Latn>měi
- &lt;/ruby>
+ &lt;ruby lang=zh-TW>美&lt;rt>ㄇㄟˇ&lt;rtc lang=zh-Latn>měi&lt;/ruby>
  </code></pre>
  </div>
 
@@ -357,10 +355,7 @@ The <dfn element><code>ruby</code></dfn> element</h3>
  and therefore share the same markup:
 
  <pre lang="zh-TW"><code highlight="html">
- &lt;ruby lang=zh-TW>
- &lt;rb>電&lt;rb>腦
- &lt;rt>ㄉㄧㄢˋ&lt;rt>ㄋㄠˇ
- &lt;/ruby>
+ &lt;ruby lang=zh-TW>&lt;rb>電&lt;rb>腦&lt;rt>ㄉㄧㄢˋ&lt;rt>ㄋㄠˇ&lt;/ruby>
  </code></pre>
  </div>
 
@@ -851,11 +846,7 @@ The <dfn element><code>rtc</code></dfn> element</h3>
  This enabled by the following markup:
 
  <pre><code highlight="html">
- &lt;ruby>
- &lt;rb>上&lt;rb>手
- &lt;rt>じよう&lt;rt>ず
- &lt;rtc>&lt;rt>jou&lt;rt>zu
- &lt;/ruby>
+ &lt;ruby>&lt;rb>上&lt;rb>手&lt;rt>じよう&lt;rt>ず&lt;rtc>&lt;rt>jou&lt;rt>zu&lt;/ruby>
  </code></pre>
  </div>
 
@@ -880,11 +871,7 @@ The <dfn element><code>rtc</code></dfn> element</h3>
  Which is marked up as follows:
 
  <pre><code highlight="html">
- &lt;ruby>
- &lt;rb>旧&lt;rb>金&lt;rb>山
- &lt;rt>jiù&lt;rt>jīn&lt;rt>shān
- &lt;rtc>San Francisco
- &lt;/ruby>
+ &lt;ruby>&lt;rb>旧&lt;rb>金&lt;rb>山&lt;rt>jiù&lt;rt>jīn&lt;rt>shān&lt;rtc>San Francisco&lt;/ruby>
  </code></pre>
 
  Here, a single base run of three base characters