PC-BSD/trueos 7e7f56dshare/man/man5 ext2fs.5 Makefile

MFC r342632:
ext2fs.5: Update the manpage.

General update of the driver description and mention some important credits.
Add a symlink for ext4fs as it is of special interest nowadays.

Fix some `mandoc -Tlint` issues while here.
DeltaFile
+26-10share/man/man5/ext2fs.5
+1-0share/man/man5/Makefile
+27-102 files

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