doc: Fix typos

From: Alexander Law <exclusion@gmail.com>

doc/src/sgml/ref/pg_xlogdump.sgml

@@ -16,7 +16,7 @@ PostgreSQL documentation
 
  <refnamediv>
   <refname>pg_xlogdump</refname>
-  <refpurpose>Display a human-readable rendering of the write-ahead log of a <productname>PostgreSQL</productname> database cluster</refpurpose>
+  <refpurpose>display a human-readable rendering of the write-ahead log of a <productname>PostgreSQL</productname> database cluster</refpurpose>
  </refnamediv>
 
  <refsynopsisdiv>

doc/src/sgml/sepgsql.sgml

@@ -675,13 +675,13 @@ ERROR:  SELinux: security policy violation
      </row>
      <row>
       <entry><literal>sepgsql_mcstrans_in(text) returns text</literal></entry>
-      <entry>Translates the given qualifies MLS/MCS range into raw format if
+      <entry>Translates the given qualified MLS/MCS range into raw format if
       the mcstrans daemon is running.
       </entry>
      </row>
      <row>
       <entry><literal>sepgsql_mcstrans_out(text) returns text</literal></entry>
-      <entry>Translates the given raw MCS/MCS range into qualified format if
+      <entry>Translates the given raw MLS/MCS range into qualified format if
       the mcstrans daemon is running.
       </entry>
      </row>