docs: init v3 bpu & fallthrough

Author: ngc7331

docs/zh/frontend/BPU/.index.md

@@ -4,10 +4,5 @@
 ``` {.include}
 
 index.md
-Composer.md
-FTB.md
-uFTB.md
-TAGE-SC.md
-ITTAGE.md
-RAS.md
+FallThrough.md
 ```