Correct formatting errors in the GNATcheck RM

Author: HugoGGuerrier

lkql_checker/doc/gnatcheck_rm/using_gnatcheck.rst

@@ -201,8 +201,8 @@ The following switches control the general ``gnatcheck`` behavior
   .. index:: --show-instantiation-chain
 
 ``--show-instantiation-chain``
-For reported generic instantiation constructs, display a chain of source
-location going from the generic unit to the instantiation.
+  For reported generic instantiation constructs, display a chain of source
+  location going from the generic unit to the instantiation.
 
   .. index:: --brief
 
@@ -948,7 +948,7 @@ The following switches from the old ``gnatcheck`` are no longer supported:
   This switch is no longer supported. You can use the GNAT Studio rule editor
   instead to create a coding standard file.
 
-.. _New_Instance_System
+.. _New_Instance_System:
 
 The new rule instance system
 ----------------------------