DOC: consistent imports (GH9886) part V
I made a few alterations to the consistent imports in the merging.rst file. 

Does anyone have any objections to what I did?

I notice a few problems with the rebase though first - that's 12 commits rather than one. 

Ok updated the commit by rebasing.
 Ok this should be all the changes done in the merging.rst file. 
 @springcoil if behooves you to keep your master up to date and clean, e.g. don't make changes on it.

so

```
git checkout master
git reset upstream/master --hard
```

then when checking out

```
git checkout master
git pull
git checkout -b mybranch --track master
```

will keep things clean
 Reopening this branch. 
 This is deprecated by [#10941](https://github.com/pydata/pandas/pull/10941)
