Overhaul and move STDOUT/STDERR redirect documentation to correct section

Prior to this commit, the STDOUT/STDERR redirect documentation was
incorrectly displayed in the "Open Test Reporting" section.

See #3166
See #4311

Author: sbrannen

documentation/src/docs/asciidoc/user-guide/advanced-topics/junit-platform-reporting.adoc

@@ -154,21 +154,6 @@ $ java -jar junit-platform-console-standalone-{platform-version}.jar <OPTIONS> \
   --config-resource=configuration.properties
 ----
 
-You can redirect standard output and standard error using the `--redirect-stdout` and
-`--redirect-stderr` options:
-
-[source,console,subs=attributes+]
-----
-$ java -jar junit-platform-console-standalone-{platform-version}.jar <OPTIONS> \
-  --redirect-stdout=foo.txt \
-  --redirect-stderr=bar.txt
-----
-
-If both the `--redirect-stdout` and `--redirect-stderr` parameters point to the same
-file, the output will be merged into that file.
-
-The default charset is used for writing to the files.
-
 [[junit-platform-reporting-legacy-xml]]
 ==== Legacy XML format
 

documentation/src/docs/asciidoc/user-guide/running-tests.adoc

@@ -812,6 +812,27 @@ You can pass a real parameter with an initial `@` character by escaping it with
 additional `@` symbol. For example, `@@somearg` will become `@somearg` and will not be
 subject to expansion.
 
+[[running-tests-console-launcher-redirecting-stdout-and-stderr]]
+==== Redirecting Standard Output/Error to Files
+
+You can redirect the `System.out` (stdout) and `System.err` (stderr) output streams to
+files using the `--redirect-stdout` and `--redirect-stderr` options:
+
+[source,console,subs=attributes+]
+----
+$ java -jar junit-platform-console-standalone-{platform-version}.jar <OPTIONS> \
+  --redirect-stdout=stdout.txt \
+  --redirect-stderr=stderr.txt
+----
+
+[NOTE]
+====
+If the `--redirect-stdout` and `--redirect-stderr` arguments point to the same file, both
+output streams will be redirected to that file.
+
+The default charset is used for writing to the files.
+====
+
 [[running-tests-console-launcher-color-customization]]
 ==== Color Customization