Fixing formatting errors

The usage of spaces instead of tabs causes the highlighting to display incorrectly on the docs.silverstripe.org site. I replaced them with tabs as they should be
Merge pull request #1286 from ss23/patch-4

Fixing formatting errors
Typo "nee" -> "need"

Looks like Silverstripe needs the d.
Merge pull request #1295 from ss23/patch-5

Typo "nee" -> "need"
Removed invalid characters

No idea what those characters were meant to be, so I removed them.
Merge pull request #1296 from ss23/patch-6

Removed invalid characters
Adjusted docs to "simple" theme (thanks Nadeeth Lansakara)
Fix minor formatting issues

Extra spaces in front of Action.
Removed the out of place text on GridField (is that meant to be a link or what?)
Missing a period on the end of some entries.
Merge pull request #1298 from ss23/patch-7

Fix minor formatting issues
FIX Respect tree node limits, fix search result node display

- Renamed $minNodeCount to more accurate $nodeCountThreshold
- The $minNodeCount attribute wasn't properly respected
during actual querying, so SilverStripe would always traverse
the entire tree (and load all objects into memory),
before then marking nodes as "unexpanded", which prevents
them from actually being rendered.
- Fixes nodes on search results to be expanded by default
- Fixes nodes on search results to correctly ajax-expand
Merge pull request #1289 from chillu/pulls/tree-node-limit

FIX Respect tree node limits, fix search result node display