Fix typos in the documentation

Change-Id: I9735914acc4fb9991eeab74f0f91f1a7baf76eb4
Signed-off-by: François Magimel <magimel.francois@gmail.com>

Author: Linkid

CONTRIBUTING.rst

@@ -1,5 +1,5 @@
 The source repository for this project can be found at:
-  
+
    https://opendev.org/openstack/cloudkitty-dashboard
 
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doc/source/installation.rst

@@ -56,14 +56,14 @@ For more details about how to add variables to Horizon settings checkout the
 Rate Pre/Postfix
 ----------------
 
-You can configure pre/postfix to rate vaules shown at the dashboard.
+You can configure pre/postfix to rate values shown at the dashboard.
 
 Here's example of setting rate currency to US Dollar.
 
 .. code-block:: python
 
    # You can choose to have prefix or postfix or both.
-   # Prefix and postfix are not mutally exclusive.
+   # Prefix and postfix are not mutually exclusive.
    OPENSTACK_CLOUDKITTY_RATE_PREFIX = '$'
    OPENSTACK_CLOUDKITTY_RATE_POSTFIX = 'USD'
 

releasenotes/notes/add-options-to-attach-pre-post-fix-to-rate-value-2d78f5cb7c289445.yaml

@@ -3,7 +3,7 @@ features:
   - |
     Adds optional Horizon settings variable OPENSTACK_CLOUDKITTY_RATE_PREFIX
     and OPENSTACK_CLOUDKITTY_RATE_POSTFIX. These allow users to attach
-    pre/postfix to their rate vaules shown at the dashboard such as currency.
+    pre/postfix to their rate values shown at the dashboard such as currency.
     These values can be set in ``.py`` settings snippets under
     ``openstack_dashboard/local/local_settings.d`` directory. Follow
     https://docs.openstack.org/horizon/latest/configuration/settings.html