add release dir

release/base/help/english/unset/=

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+
+ Usage:
+
+    unset <variable-name>
+
+ 'unset' causes the specified variable to _have_no_value_.  This means that
+ it will not be used by archie until it has been given a value with the 'set'
+ command.
+
+
+ Note: this may cause "counter-intuitive" behaviour in some cases (e.g. in
+       the case of "maxhits").  Although one might expect 'prog' to print
+       matches without regard for any limit, this is not the case.  If the
+       value of "maxhits" is not available it will merely fall back to some
+       internal default.
+