Documentation for automatic closing unused presentation compilers

Documentation for automatic closing unused presentation compilers (https://github.com/scala-ide/scala-ide/pull/765)
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'after which *the* presentation' 
'You can also decide whether inactive presentation compilers should be closed even if there are opened Scala Editors for the files they manage.'
'Notice that when you open' (remove comma + 'when')
'start typing in *an* existing file in that *case*, its presentation compiler' (we've recently decoupled project/PC)
'This can cause *a* small delay' 
'There *are* no other'