Change syntax of the env.clear statement.

It no longer requires an argument. The correct syntax is

  env {
     clear;
  }

1 files changed, 7 insertions, 8 deletions

diff --git a/doc/pies.texi b/doc/pies.texi
index ccb9f0e..63064e5 100644
--- a/doc/pies.texi
+++ b/doc/pies.texi
@@ -1061,7 +1061,7 @@ The compound @code{env} statement has the following syntax:
 @example
 @group
 env @{
-   clear @var{bool};
+   clear;
    keep @var{pattern};
    set "@var{name}=@var{value}";
    unset @var{pattern};
@@ -1075,11 +1075,10 @@ modify the environment.  The @code{clear} and @code{keep} statements
 are executed first.  Then, the @code{set} and @code{unset} statements
 are applied in the order of their appearance in the configuration.
 
-@deffn {env} clear @var{bool}
-If @var{bool} is @samp{yes}, all environment variables will be cleared
-(unset).  The resulting environment will be empty, unless one or more
-@code{keep} statements are also given (see below).  The @code{clear}
-statement is always executed first.
+@deffn {env} clear
+Clears the environment by removing (unsetting) all variables, except
+those listed in @code{keep} statements, if such are given (see below).
+The @code{clear} statement is always executed first.
 @end deffn
 
 @deffn {env} keep @var{pattern}
@@ -1093,7 +1092,7 @@ environment all variables except @samp{HOME}, @samp{USER},
 @example
 @group
 env @{
-  clear yes;
+  clear;
   keep HOME;
   keep USER;
   keep PATH;
@@ -1171,7 +1170,7 @@ The modern syntax equivalent is:
 @example
 @group
 env @{
-  clear yes;
+  clear;
 @}
 @end group
 @end example