[FAB-6173] Revise Jira navigation document

Fix typos.

Change-Id: I0223b6aba93d54971168cfb7e17c8bfe91391d32
Signed-off-by: Boliang Chen <cblsjtu@gmail.com>

docs/source/jira_navigation.rst

@@ -2,7 +2,7 @@ Using Jira to understand current work items
 ===========================================
 
 This document has been created to give further insight into the work in
-progress towards the hyperledger/fabric v1 architecture based off the
+progress towards the Hyperledger Fabric v1 architecture based on the
 community roadmap. The requirements for the roadmap are being tracked in
 `Jira <https://jira.hyperledger.org/>`__.
 
@@ -46,12 +46,12 @@ The meanings to these columns are as follows:
 
 -  Backlog – list of items slated for the current sprint (sprints are
    defined in 2 week iterations), but are not currently in progress
--  In progress – are items currently being worked by someone in the
+-  In progress – items currently being worked by someone in the
    community.
--  In Review – waiting to be reviewed and merged in Gerritt
--  Done – merged and complete in the sprint.
+-  In Review – items waiting to be reviewed and merged in Gerrit
+-  Done – items merged and complete in the sprint.
 
-If you want to see all items in the backlog for a given feature set
+If you want to see all items in the backlog for a given feature set,
 click on the stacked rows on the left navigation of the screen:
 
 .. figure:: images/Jira4.png