[7.0.0] Document --experimental_output_paths (#19993)

Closes #19891.

Commit
6191a70

PiperOrigin-RevId: 577970043
Change-Id: Ia5e9386d6fe6e0601787ec069d9054b0b8cf1418

Co-authored-by: Fabian Meumertzheim <fabian@meumertzhe.im>

src/main/java/com/google/devtools/build/lib/analysis/config/CoreOptions.java

@@ -793,7 +793,7 @@ public OutputPathsConverter() {
       name = "experimental_output_paths",
       converter = OutputPathsConverter.class,
       defaultValue = "off",
-      documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
+      documentationCategory = OptionDocumentationCategory.OUTPUT_PARAMETERS,
       effectTags = {
         OptionEffectTag.LOSES_INCREMENTAL_STATE,
         OptionEffectTag.BAZEL_INTERNAL_CONFIGURATION,