[PATCH v4 10/11] doc: correct errors in stack library guide

[Stephen Hemminger <stephen@networkplumber.org>]

Fix several errors in the stack library documentation:

- Fix grammar: "These function are" -> "These functions are"
- Fix grammar: "incorrect change" -> "incorrectly change"
- Fix RST section hierarchy: "Implementation" was marked as a
  subsection (~~~~) but contained sections (----); corrected so
  Implementation is a section and Lock-based/Lock-free stack are
  subsections beneath it
- Fix inconsistent header capitalization: "Lock-based Stack" and
  "Lock-free Stack" -> lowercase "stack" to match other DPDK docs
- Fix awkward wording: "this algorithm stack uses" -> "this algorithm
  uses"
- Fix inconsistent underline lengths in RST headers
- Add code formatting to function name: rte_stack_create() with
  backticks and parentheses
- Fix hyphenation: "multi-threading safe" -> "multi-thread safe"
  (matches line 37 usage)

Signed-off-by: Nandini Persad <nandinipersad361@gmail.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 doc/guides/prog_guide/stack_lib.rst | 32 ++++++++++++++---------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/doc/guides/prog_guide/stack_lib.rst b/doc/guides/prog_guide/stack_lib.rst
index 975d3ad796..1ca9d73bc0 100644
--- a/doc/guides/prog_guide/stack_lib.rst
+++ b/doc/guides/prog_guide/stack_lib.rst
@@ -13,8 +13,8 @@ The stack library provides the following basic operations:
    user-specified socket, with either standard (lock-based) or lock-free
    behavior.
 
-*  Push and pop a burst of one or more stack objects (pointers). These function
-   are multi-threading safe.
+*  Push and pop a burst of one or more stack objects (pointers). These functions
+   are multi-thread safe.
 
 *  Free a previously created stack.
 
@@ -23,15 +23,15 @@ The stack library provides the following basic operations:
 *  Query a stack's current depth and number of free entries.
 
 Implementation
-~~~~~~~~~~~~~~
+--------------
 
 The library supports two types of stacks: standard (lock-based) and lock-free.
 Both types use the same set of interfaces, but their implementations differ.
 
 .. _Stack_Library_Std_Stack:
 
-Lock-based Stack
-----------------
+Lock-based stack
+~~~~~~~~~~~~~~~~
 
 The lock-based stack consists of a contiguous array of pointers, a current
 index, and a spinlock. Accesses to the stack are made multi-thread safe by the
@@ -39,13 +39,13 @@ spinlock.
 
 .. _Stack_Library_LF_Stack:
 
-Lock-free Stack
-------------------
+Lock-free stack
+~~~~~~~~~~~~~~~
 
 The lock-free stack consists of a linked list of elements, each containing a
 data pointer and a next pointer, and an atomic stack depth counter. The
-lock-free property means that multiple threads can push and pop simultaneously,
-and one thread being preempted/delayed in a push or pop operation will not
+lock-free property means that multiple threads can push and pop simultaneously.
+One thread being preempted/delayed in a push or pop operation will not
 impede the forward progress of any other thread.
 
 The lock-free push operation enqueues a linked list of pointers by pointing the
@@ -65,15 +65,15 @@ allocated before stack pushes and freed after stack pops. Since the stack has a
 fixed maximum depth, these elements do not need to be dynamically created.
 
 The lock-free behavior is selected by passing the *RTE_STACK_F_LF* flag to
-rte_stack_create().
+``rte_stack_create()``.
 
-Preventing the ABA Problem
+Preventing the ABA problem
 ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-To prevent the ABA problem, this algorithm stack uses a 128-bit
-compare-and-swap instruction to atomically update both the stack top pointer
-and a modification counter. The ABA problem can occur without a modification
-counter if, for example:
+To prevent the ABA problem, this algorithm uses a 128-bit compare-and-swap
+instruction to atomically update both the stack top pointer and a modification
+counter. The ABA problem can occur without a modification counter if, for
+example:
 
 #. Thread A reads head pointer X and stores the pointed-to list element.
 
@@ -83,7 +83,7 @@ counter if, for example:
 #. Thread A changes the head pointer with a compare-and-swap and succeeds.
 
 In this case thread A would not detect that the list had changed, and would
-both pop stale data and incorrect change the head pointer. By adding a
+both pop stale data and incorrectly change the head pointer. By adding a
 modification counter that is updated on every push and pop as part of the
 compare-and-swap, the algorithm can detect when the list changes even if the
 head pointer remains the same.
-- 
2.51.0