doc: remove trailing spaces

Remove trailing spaces on lines to avoid potential issues with git

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>

doc/developer-guides/doc_guidelines.rst

@@ -18,7 +18,7 @@ and about `Sphinx extensions`_ from their respective websites.
 
 .. _Sphinx extensions: https://www.sphinx-doc.org/en/stable/contents.html
 .. _reStructuredText: http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html
-.. _Sphinx Inline Markup: https://www.sphinx-doc.org/en/master/usage/restructuredtext/roles.html 
+.. _Sphinx Inline Markup: https://www.sphinx-doc.org/en/master/usage/restructuredtext/roles.html
 .. _Project ACRN documentation:  https://projectacrn.github.io
 
 This document provides a quick reference for commonly used reST and

doc/developer-guides/hld/hld-devicemodel.rst

@@ -1192,5 +1192,5 @@ S3.
 Pass-through in Device Model
 ****************************
 
-You may refer to :ref:`hv-device-passthrough` for pass-through realization 
+You may refer to :ref:`hv-device-passthrough` for pass-through realization
 in device model.

doc/developer-guides/hld/hld-security.rst

@@ -386,7 +386,7 @@ three typical solutions exist:
    may even require the hypervisor to flush the TLB. This solution won't
    be used by the ACRN hypervisor.
 
-#. **Use CR0.WP (write-protection) bit.** 
+#. **Use CR0.WP (write-protection) bit.**
 
    This processor feature allows
    pages to be protected from supervisor-mode write access.

doc/developer-guides/hld/hld-virtio-devices.rst

@@ -111,7 +111,7 @@ Efficient: batching operation is encouraged
   high-performance I/O, since notification between FE and BE driver
   usually involves an expensive exit of the guest. Therefore batching
   operating and notification suppression are highly encouraged if
-  possible. This will give an efficient implementation for 
+  possible. This will give an efficient implementation for
   performance-critical devices.
 
 Standard: virtqueue
@@ -120,7 +120,7 @@ Standard: virtqueue
   queue of scatter-gather buffers. There are three important methods on
   virtqueues:
 
-  - **add_buf** is for adding a request/response buffer in a virtqueue, 
+  - **add_buf** is for adding a request/response buffer in a virtqueue,
   - **get_buf** is for getting a response/request in a virtqueue, and
   - **kick** is for notifying the other side for a virtqueue to consume buffers.
 

doc/developer-guides/hld/hv-pm.rst

@@ -33,7 +33,7 @@ power state transition:
 -  Pauses Service VM.
 -  Wait all other guests enter low power state.
 -  Offlines all physical APs.
--  Save the context of console, ioapic of Service VM, I/O MMU, lapic of 
+-  Save the context of console, ioapic of Service VM, I/O MMU, lapic of
    Service VM, virtual BSP.
 -  Save the context of physical BSP.