Rename config section headings.

Simon Riggs

doc/src/sgml/config.sgml

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 <chapter Id="runtime-config">
-  <title>Run-time Configuration</title>
+  <title>Server Configuration</title>
 
   <indexterm>
    <primary>configuration</primary>

doc/src/sgml/runtime.sgml

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+$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.356 2005/10/26 12:55:07 momjian Exp $
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 <chapter Id="runtime">
- <title>Server Run-time Environment</title>
+ <title>Operating System Environment</title>
 
  <para>
   This chapter discusses how to set up and run the database server