doc: hotfix build issue blocked by l1tf.rst
fix indent and Title alignmeng.
@@ -113,7 +113,7 @@ same pCPU thus next VM may steal information in L1D which comes
from activity of previous VM on the same pCPU.
Normal_world->Secure_world Attack
-******************************
+*********************************
ACRN supports Android guest, which requires two running worlds
(normal world vs. secure world). Two worlds run on the same CPU,
