Adding a few links in the documentation

Adding a few links to the documentation regarding configuration settings.

doc/customize.doc

@@ -181,6 +181,7 @@ optionally the name of the layout file can be specified, if omitted
 \c DoxygenLayout.xml will be used.
 
 The next step is to mention the layout file in the configuration file
+(see also \ref cfg_layout_file "LAYOUT_FILE")
 \verbatim
 LAYOUT_FILE = DoxygenLayout.xml
 \endverbatim

doc/diagrams.doc

@@ -178,8 +178,7 @@ that doxygen can generate:
 
 \htmlonly
 Click <a href="examples/diagrams/html/annotated.html">here</a>
-for the corresponding HTML documentation that is generated by doxygen<br/>
-(<code>EXTRACT_ALL</code> = <code>YES</code> is used here).
+for the corresponding HTML documentation that is generated by doxygen.
 \endhtmlonly
 \latexonly
 \IfFileExists{../html/examples/diagrams/latex/refman_doc.tex}
@@ -188,6 +187,7 @@ See \hyperlink{diagrams_example}{Diagrams example}
 for the corresponding \mbox{\LaTeX} documentation that is generated by doxygen.
 } {}
 \endlatexonly
+Note \ref cfg_extract_all "EXTRACT_ALL" \c = \c YES is used to generate the diagrams.
 
 \htmlonly
 Go to the <a href="preprocessing.html">next</a> section or return to the

doc/docblocks.doc

@@ -134,7 +134,7 @@ or
  ***********************************************/
 \endverbatim
 
-as long as JAVADOC_BANNER = YES is used.
+as long as \ref cfg_javadoc_banner "JAVADOC_BANNER" is set to \c YES.
 \include javadoc-banner.h
  \htmlonly
  Click <a href="examples/javadoc-banner/html/javadoc-banner_8h.html">here</a>