[Review]: PEP-8 fixes to several files in the map/ directory.

New pull request after the last one (#984)  accidentally included previous changes.

Would this not print also all the spaces? I believe the triple quote (""") keeps all as it is.  I don't think we want to show all these spaces when printing a map.

So what I mean is that we want:
```
SunPy Map
----------
Observatory: XXX
Instrument: XXX
...
```
 and I believe with the above we would get:
```
      SunPy Map
      ----------
      Observatory: XXX
      Instrument: XXX
      ...
```