DOC: typo fix in pg_variables

Author: Liudmila Mantrova

doc/src/sgml/pg_variables.sgml

@@ -531,7 +531,7 @@ ERROR:  variable "int1" requires "integer" value
     <sect3 id="pg-variables-date-variables">
       <title>Date Variables (Deprecated)</title>
       <para>
-       The following functions for are deprecated.
+       The following functions are deprecated.
        Use generic functions for <link linkend="pg-variables-scalar-variables">scalar variables</link> instead.
       </para>
       <informaltable>
@@ -570,7 +570,7 @@ ERROR:  variable "int1" requires "integer" value
     <sect3 id="pg-variables-jsonb-variables">
       <title>Jsonb Variables (Deprecated)</title>
       <para>
-       The following functions for are deprecated.
+       The following functions are deprecated.
        Use generic functions for <link linkend="pg-variables-scalar-variables">scalar variables</link> instead.
       </para>
       <informaltable>