Remove references to 'bold' text in reference docs

<emphasis role="bold"> blocks do not render properly, probably due to
conflicting CSS used for syntax highlighting. For the moment, any
mentions of bold text (e.g. "see bold text in the snippet below") have
been removed to avoid confusion as reported in SPR-8520.  SPR-8526 has
been created to address the underlying issue of getting bold to work
even with syntax highlighting.

Issue: SPR-8520, SPR-8526

spring-framework-reference/src/oxm.xml

@@ -311,7 +311,7 @@ public class Application {
        	<para>
        		Marshallers could be configured more concisely using tags from the OXM namespace.
        		To make these tags available, the appropriate schema has to be referenced first in the preamble of the XML configuration file.
-       		The emboldened text	in the below snippet references the OXM schema:
+       		Note the 'oxm' related text below:
        	</para>
        	<programlisting language="xml"><![CDATA[<?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"