Typo fixes.

expect -> except, noted by Andrew Dunstan.  Also, "cannot" seems more
readable here than "can not", per David Wheeler.

doc/src/sgml/func.sgml

@@ -15024,8 +15024,8 @@ SELECT (pg_stat_file('filename')).modification;
    </indexterm>
    <para>
     <function>pg_advisory_xact_lock</> works the same as
-    <function>pg_advisory_lock</>, expect the lock is automatically released
-    at the end of the current transaction and can not be released explicitly.
+    <function>pg_advisory_lock</>, except the lock is automatically released
+    at the end of the current transaction and cannot be released explicitly.
    </para>
 
    <indexterm>
@@ -15033,8 +15033,8 @@ SELECT (pg_stat_file('filename')).modification;
    </indexterm>
    <para>
     <function>pg_advisory_xact_lock_shared</> works the same as
-    <function>pg_advisory_lock_shared</>, expect the lock is automatically released
-    at the end of the current transaction and can not be released explicitly.
+    <function>pg_advisory_lock_shared</>, except the lock is automatically released
+    at the end of the current transaction and cannot be released explicitly.
    </para>
 
    <indexterm>
@@ -15042,9 +15042,9 @@ SELECT (pg_stat_file('filename')).modification;
    </indexterm>
    <para>
     <function>pg_try_advisory_xact_lock</> works the same as
-    <function>pg_try_advisory_lock</>, expect the lock, if acquired,
+    <function>pg_try_advisory_lock</>, except the lock, if acquired,
     is automatically released at the end of the current transaction and
-    can not be released explicitly.
+    cannot be released explicitly.
    </para>
 
    <indexterm>
@@ -15052,9 +15052,9 @@ SELECT (pg_stat_file('filename')).modification;
    </indexterm>
    <para>
     <function>pg_try_advisory_xact_lock_shared</> works the same as
-    <function>pg_try_advisory_lock_shared</>, expect the lock, if acquired,
+    <function>pg_try_advisory_lock_shared</>, except the lock, if acquired,
     is automatically released at the end of the current transaction and
-    can not be released explicitly.
+    cannot be released explicitly.
    </para>
 
    <indexterm>