Spellcheck: environment, appropriate, explanation, occasions

Found by:	make spellcheck

en_US.ISO8859-1/books/handbook/disks/chapter.sgml

@@ -2315,7 +2315,7 @@ sa0(ncr1:4:0):  Logical unit is in process of becoming ready</screen>
       </example>
 
       <para>Or using <command>dump</command>'s built-in method,
-        setting the enviroment variable <envar>RSH</envar>:</para>
+        setting the environment variable <envar>RSH</envar>:</para>
 
       <example>
 	<title>Using <command>dump</command> over <application>ssh</application> with <envar>RSH</envar> set</title>

en_US.ISO8859-1/books/handbook/multimedia/chapter.sgml

@@ -546,7 +546,7 @@ pcm0: &lt;SB16 DSP 4.11&gt; on sbc0</screen>
       you to set values for the mixer they remember and set
       each time they are started, but this is not a clean
       solution, we want to have default values at the driver
-      level.  This is accomplished by defining the apropriate
+      level.  This is accomplished by defining the appropriate
       values in <filename>/boot/device.hints</filename>. E.g.:</para>
 <programlisting>hint.pcm.0.vol="100"</programlisting>
 

en_US.ISO8859-1/books/handbook/serialcomms/chapter.sgml

@@ -1937,7 +1937,7 @@ raisechar=^^</programlisting>
       <para>This section assumes that you are using the default setup,
 	know how to connect serial ports and just want a fast overview
 	of a serial console.  If you encounter difficulty with these
-	steps, please see the more extensive explaination of all the
+	steps, please see the more extensive explanation of all the
 	options and advanced settings in
 	<xref linkend="serialconsole-howto">.</para>
 

en_US.ISO8859-1/share/sgml/glossary/freebsd-glossary.sgml

@@ -130,7 +130,7 @@
       <glossdef>
 	<para>In the normal course of FreeBSD development, a change will
 	  be committed to the -CURRENT branch for testing before being
-	  merged to -STABLE.  On rare occassions, a change will go into
+	  merged to -STABLE.  On rare occasions, a change will go into
 	  -STABLE first and then be merged to -CURRENT.</para>
 
 	<para>This term is also used when a patch is merged from -STABLE