Update BRANCH_DEFAULT_MODULE_BUILD_FROM_SOURCE documentation
With trunk stable, we no longer have multiple development branches, and
this flag is no longer in use.
Test: N/A (documentation change)
Bug: 308188056
Change-Id: Icdaddde9d107de9a453106cae35645b7e6cc21e9
diff --git a/core/product.mk b/core/product.mk
index f8634ef..0a761fb 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -418,8 +418,9 @@
# /system/etc/security/fsverity/BuildManifest.apk
_product_single_value_vars += PRODUCT_FSVERITY_GENERATE_METADATA
-# If true, sets the default for MODULE_BUILD_FROM_SOURCE. This overrides
-# BRANCH_DEFAULT_MODULE_BUILD_FROM_SOURCE but not an explicitly set value.
+# If true, this builds the mainline modules from source. This overrides any
+# prebuilts selected via RELEASE_APEX_CONTRIBUTIONS_* build flags for the
+# current release config.
_product_single_value_vars += PRODUCT_MODULE_BUILD_FROM_SOURCE
# If true, installs a full version of com.android.virt APEX.