use readers instead of viewers for readability

It is more natural.

Signed-off-by: Takashi Sakamoto <takaswie@kernel.org>
diff --git a/index.rst b/index.rst
index d03d7c0..474736b 100644
--- a/index.rst
+++ b/index.rst
@@ -13,9 +13,9 @@
 ============
 
 ..
-  This section provides the viewers the information about what to be described in the series of
-  documentation so that the viewers get an understanding of the subsystem by the provided
-  information in the documentation. However, the viewers get no learning and tasks from the
+  This section provides the readers the information about what to be described in the series of
+  documentation so that the readers get an understanding of the subsystem by the provided
+  information in the documentation. However, the readers get no learning and tasks from the
   documentation.
 
 IEEE 1394 as known as FireWire is the technology established between the late of 1980's and the
@@ -32,7 +32,7 @@
 =====================
 
 ..
-  This section provides the viewers the information about the way to communicate with the users and
+  This section provides the readers the information about the way to communicate with the users and
   developers, as well as code of conduct in the communication.
 
 * `linux1394-devel <http://lists.sourceforge.net/mailman/listinfo/linux1394-devel>`_ is dedicated
@@ -48,7 +48,7 @@
 ========================
 
 ..
-  This section provides the viewers the information about contribution to the subsystem. Especially
+  This section provides the readers the information about contribution to the subsystem. Especially
   the items which we expected and we do not expected.
 
 As of 2023, few developers work to use the subsystem. We appreciate any type of help for it. For
@@ -70,7 +70,7 @@
 ==================
 
 ..
-  This section provides the viewers the information about included documents.
+  This section provides the readers the information about included documents.
 
 .. toctree::
    :hidden:
@@ -111,7 +111,7 @@
 ============
 
 ..
-  This section provides the viewers the information about the subsystem, libraries, utilities, and
+  This section provides the readers the information about the subsystem, libraries, utilities, and
   resources. Especially for package maintainers in Linux distribution the way to retrieve their
   package archive.
 
@@ -179,7 +179,7 @@
 ====================
 
 ..
-  This section provides the viewers the information about schedule to maintain the subsystem for
+  This section provides the readers the information about schedule to maintain the subsystem for
   the next six years.
 
 As you know, IEEE 1394 is enough legacy. Sooner or later, users would leave. This subsystem has a
@@ -235,7 +235,7 @@
 ===================
 
 ..
-  This section provides the viewers the information about this documentation.
+  This section provides the readers the information about this documentation.
   - the location of repository
   - the hosting service
   - the archive of old wiki