use html entities rather than the ISO 8859 version

docs/uclibc.org/FAQ.html

@@ -53,7 +53,7 @@ have additions to this FAQ document, we would love to add them,
 <h2><a name="naming">Why is it called uClibc?</a></h2>
 <p>
 
-    The letter 'u' is short for µ (the greek letter "mu").  µ is commonly used
+    The letter 'u' is short for &#181; (the greek letter "mu").  &#181; is commonly used
     as the abbreviation for the word "micro".  The capital "C" is short for
     "controller".  So the name uClibc is sortof an abbreviation for "the
     microcontroller C library".  For simplicity, uClibc is pronounced