doc: Mention environment variable ZSTD in the TAP tests for MSVC

6c417bb has added the build infrastructure to support ZSTD, but forgot
to update this section of the docs to mention the variable ZSTD, as per
the change done in vcregress.pl.

While on it, reword this section of the docs to describe what happens in
the default case, as per a suggestion from Robert Haas.

Discussion: https://postgr.es/m/YhCL0fKnDv/[email protected]

diff --git a/doc/src/sgml/install-windows.sgml b/doc/src/sgml/install-windows.sgml
index 98fa6962f68fda6d2a75d10f33761fcb82ae8f52..43d05bde4ec03783c73d14b5a65d239bc42f9a89 100644 (file)
--- a/doc/src/sgml/install-windows.sgml
+++ b/doc/src/sgml/install-windows.sgml
@@ -534,9 +534,9 @@ $ENV{PROVE_TESTS}='t/020*.pl t/010*.pl'
     <varlistentry>
      <term><varname>GZIP_PROGRAM</varname></term>
      <listitem><para>
-       Path to a <application>gzip</application> command. The default is
-       <literal>gzip</literal>, that would be the command found in
-      <varname>PATH</varname>.
+      Path to a <application>gzip</application> command. The default is
+      <literal>gzip</literal>, which will search for a command by that
+      name in the configured <envar>PATH</envar>.
      </para></listitem>
     </varlistentry>
 
@@ -544,8 +544,8 @@ $ENV{PROVE_TESTS}='t/020*.pl t/010*.pl'
      <term><varname>LZ4</varname></term>
      <listitem><para>
       Path to a <application>lz4</application> command. The default is
-      <literal>lz4</literal>, that would be the command found in
-      <varname>PATH</varname>.
+      <literal>lz4</literal>, which will search for a command by that
+      name in the configured <envar>PATH</envar>.
      </para></listitem>
     </varlistentry>
 
@@ -553,8 +553,17 @@ $ENV{PROVE_TESTS}='t/020*.pl t/010*.pl'
      <term><varname>TAR</varname></term>
      <listitem><para>
       Path to a <application>tar</application> command. The default is
-      <literal>tar</literal>, that would be the command found in
-      <varname>PATH</varname>.
+      <literal>tar</literal>, which will search for a command by that
+      name in the configured <envar>PATH</envar>.
+     </para></listitem>
+    </varlistentry>
+
+    <varlistentry>
+     <term><varname>ZSTD</varname></term>
+     <listitem><para>
+      Path to a <application>zstd</application> command. The default is
+      <literal>zstd</literal>, which will search for a command by that
+      name in the configured <envar>PATH</envar>.
      </para></listitem>
     </varlistentry>
    </variablelist>