docs: fix markup errors

docs/development.rst

@@ -127,6 +127,7 @@ e.g. 1.4.x).
 
 Start by checking out the appropriate branch:
 ::
+
     git checkout master
 
 It is best practice for a developer to keep local ``master`` branch as an
@@ -140,16 +141,19 @@ only to ``master``.
 
 Thus, create a new branch now:
 ::
+
     git checkout -b MYCONTRIB-master  # choose an appropriate own branch name
 
 Now, work on your contribution in that branch. Use these git commands:
 ::
+
     git status   # is there anything that needs to be added?
     git add ...  # if so, add it
     git commit   # finally, commit it. use a descriptive comment.
 
 Then push the changes to your Github repository:
 ::
+
     git push --set-upstream origin MYCONTRIB-master
 
 Finally, make a pull request on ``borgbackup/borg`` Github repository against
@@ -170,6 +174,7 @@ Next, check out the ``master`` branch again. Find the commit hash of the last
 commit that was made before you started working on your contribution and perform
 a hard reset.
 ::
+
     git checkout master
     git log
     git reset --hard THATHASH
@@ -177,6 +182,7 @@ a hard reset.
 Then, update the local ``master`` branch with changes made in the upstream
 repository.
 ::
+
     git pull borg master
 
 Rebase feature branch onto updated master branch
@@ -185,6 +191,7 @@ Rebase feature branch onto updated master branch
 After updating the local ``master`` branch from upstream, the feature branch
 can be checked out and rebased onto (the now uptodate) ``master`` branch.
 ::
+
     git checkout MYCONTRIB-master
     git rebase -i master
 
@@ -192,6 +199,7 @@ Next, check if there are any commits that exist in the feature branch
 but not in the ``master`` branch and vice versa. If there are no
 conflicts or after resolving them, push your changes to your Github repository.
 ::
+
     git log
     git diff master
     git push -f