Doc: Fix some spelling mistakes

Author: Daniel Gustafsson
Discussion: https://postgr.es/m/7838B8EE-CFD6-48D7-AE2D-520D69FD84BD@yesql.se

doc/src/sgml/postgres-fdw.sgml

@@ -386,7 +386,7 @@ OPTIONS (ADD password_required 'false');
     <filename>postgres_fdw</filename> supports asynchronous execution, which
     runs multiple parts of an <structname>Append</structname> node
     concurrently rather than serially to improve performance.
-    This execution can be controled using the following option:
+    This execution can be controlled using the following option:
    </para>
 
    <variablelist>

doc/src/sgml/ref/analyze.sgml

@@ -255,7 +255,7 @@ ANALYZE [ VERBOSE ] [ <replaceable class="parameter">table_and_columns</replacea
    in addition, it will recurse into each partition and update its statistics.
    (However, in multi-level partitioning scenarios, each leaf partition
    will only be analyzed once.)
-   By constrast, if the table being analyzed has inheritance children,
+   By contrast, if the table being analyzed has inheritance children,
    <command>ANALYZE</command> will gather statistics for it twice:
    once on the rows of the parent table only, and a second time on the
    rows of the parent table with all of its children.  This second set of

doc/src/sgml/ref/pg_amcheck.sgml

@@ -290,7 +290,7 @@ PostgreSQL documentation
        or <literal>--relation</literal> matches no objects, it is a fatal
        error. This option downgrades that error to a warning.
        If this option is used with <literal>--quiet</literal>, the warning
-       will be supressed as well.
+       will be suppressed as well.
       </para>
      </listitem>
     </varlistentry>