[PATCH v2] Documentation: RCU: whatisRCU: Fix formatting for section 2

[Amol Grover]

Convert RCU API methods text to sub-headings and
add footnote linking to 2 literary notes
under rcu_dereference() section for improved UX

Signed-off-by: Amol Grover <frextrite@xxxxxxxxx>
---
 Documentation/RCU/whatisRCU.rst | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/Documentation/RCU/whatisRCU.rst b/Documentation/RCU/whatisRCU.rst
index ae40c8bcc56c..4c6f1f595757 100644
--- a/Documentation/RCU/whatisRCU.rst
+++ b/Documentation/RCU/whatisRCU.rst
@@ -150,6 +150,7 @@ later.  See the kernel docbook documentation for more info, or look directly
 at the function header comments.
 
 rcu_read_lock()
+^^^^^^^^^^^^^^^
 
 	void rcu_read_lock(void);
 
@@ -164,6 +165,7 @@ rcu_read_lock()
 	longer-term references to data structures.
 
 rcu_read_unlock()
+^^^^^^^^^^^^^^^^^
 
 	void rcu_read_unlock(void);
 
@@ -172,6 +174,7 @@ rcu_read_unlock()
 	read-side critical sections may be nested and/or overlapping.
 
 synchronize_rcu()
+^^^^^^^^^^^^^^^^^
 
 	void synchronize_rcu(void);
 
@@ -225,6 +228,7 @@ synchronize_rcu()
 	checklist.txt for some approaches to limiting the update rate.
 
 rcu_assign_pointer()
+^^^^^^^^^^^^^^^^^^^^
 
 	void rcu_assign_pointer(p, typeof(p) v);
 
@@ -245,6 +249,7 @@ rcu_assign_pointer()
 	the _rcu list-manipulation primitives such as list_add_rcu().
 
 rcu_dereference()
+^^^^^^^^^^^^^^^^^
 
 	typeof(p) rcu_dereference(p);
 
@@ -280,7 +285,7 @@ rcu_dereference()
 	unnecessary overhead on Alpha CPUs.
 
 	Note that the value returned by rcu_dereference() is valid
-	only within the enclosing RCU read-side critical section [1].
+	only within the enclosing RCU read-side critical section [1]_.
 	For example, the following is -not- legal::
 
 		rcu_read_lock();
@@ -304,9 +309,9 @@ rcu_dereference()
 	at any time, including immediately after the rcu_dereference().
 	And, again like rcu_assign_pointer(), rcu_dereference() is
 	typically used indirectly, via the _rcu list-manipulation
-	primitives, such as list_for_each_entry_rcu() [2].
+	primitives, such as list_for_each_entry_rcu() [2]_.
 
-	[1] The variant rcu_dereference_protected() can be used outside
+..	[1] The variant rcu_dereference_protected() can be used outside
 	of an RCU read-side critical section as long as the usage is
 	protected by locks acquired by the update-side code.  This variant
 	avoids the lockdep warning that would happen when using (for
@@ -319,7 +324,8 @@ rcu_dereference()
 	a lockdep splat is emitted.  See Documentation/RCU/Design/Requirements/Requirements.rst
 	and the API's code comments for more details and example usage.
 
-	[2] If the list_for_each_entry_rcu() instance might be used by
+
+..	[2] If the list_for_each_entry_rcu() instance might be used by
 	update-side code as well as by RCU readers, then an additional
 	lockdep expression can be added to its list of arguments.
 	For example, given an additional "lock_is_held(&mylock)" argument,
-- 
2.20.1