Change example indentation to 2 spaces (mobile friendly) (haskell-inf…

…ra#254)

See <haskell-infra#251 (comment)>

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@@ -22,9 +22,9 @@ <h4 class="summary">An advanced, purely functional programming language</h4>
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                   <h4 class="tag">Declarative, statically typed code.</h4>
                   <div title="This example is contrived in order to demonstrate what Haskell looks like, including: (1) where syntax, (2) enumeration syntax, (3) pattern matching, (4) consing as an operator, (5) list comprehensions, (6) infix functions. Don&#39;t take it seriously as an efficient prime number generator." class="code-sample">
-                     <pre><span class='hs-definition'>primes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filterPrime</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>2</span><span class='hs-keyglyph'>..</span><span class='hs-keyglyph'>]</span>
-      <span class='hs-keyword'>where</span> <span class='hs-varid'>filterPrime</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
-              <span class='hs-varid'>p</span> <span class='hs-conop'>:</span> <span class='hs-varid'>filterPrime</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>xs</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`mod`</span> <span class='hs-varid'>p</span> <span class='hs-varop'>/=</span> <span class='hs-num'>0</span><span class='hs-keyglyph'>]</span></pre>
+                     <pre><span class='hs-definition'>primes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filterPrime</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>2</span><span class='hs-keyglyph'>..</span><span class='hs-keyglyph'>]</span> <span class='hs-keyword'>where</span>
+  <span class='hs-varid'>filterPrime</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
+    <span class='hs-varid'>p</span> <span class='hs-conop'>:</span> <span class='hs-varid'>filterPrime</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>xs</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`mod`</span> <span class='hs-varid'>p</span> <span class='hs-varop'>/=</span> <span class='hs-num'>0</span><span class='hs-keyglyph'>]</span></pre>
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