turborepo

d5c95a28 - docs: Add `turboExtendsKeyword` future flag and `$TURBO_EXTENDS$` microsyntax (#11246)

docs: Add `turboExtendsKeyword` future flag and `$TURBO_EXTENDS$` microsyntax (#11246) ### Description Documenting `turboExtendsKeyword` future flag and `$TURBO_EXTENDS$` microsyntax. ### Testing Instructions 👀 _{CLOSES TURBO-4940} --------- Co-authored-by: Cursor Agent <cursoragent@cursor.com>