fix typos and troubleshooting in areaDetector viewers doc

Fix a few typos in the areaDetector viewers documentation.

Remove from the areaDetector viewers documentation troubleshooting
section the statement that the EPICS_CA_MAX_ARRAY_BYTES environment
variable is not used by the ImageJ viewer.  This used to be true, but
it's no longer true as of areaDetector R1-9.
Merge pull request #46 from jlmuir/fix-areaDetectorViewers-doc-typos

fix typos and troubleshooting in areaDetector viewers doc
Got HDF5 plugin working, better reporting, callbacks working even if EPICS_LIBCOM_ONLY not defined
More initialization
Fixed bug introduced when NDFileLazyOpen was moved to asynNDArrayDriver