doc: Update more docstrings to have one sentence summary as first line. Reviewed miscellaneous, sparse, strings in scripts directory. * scripts/miscellaneous/bzip2.m, scripts/miscellaneous/citation.m, scripts/miscellaneous/compare_versions.m, scripts/miscellaneous/computer.m, scripts/miscellaneous/debug.m, scripts/miscellaneous/dir.m, scripts/miscellaneous/edit.m, scripts/miscellaneous/error_ids.m, scripts/miscellaneous/fileattrib.m, scripts/miscellaneous/fullfile.m, scripts/miscellaneous/genvarname.m, scripts/miscellaneous/gzip.m, scripts/miscellaneous/mkoctfile.m, scripts/miscellaneous/news.m, scripts/miscellaneous/open.m, scripts/miscellaneous/parseparams.m, scripts/miscellaneous/recycle.m, scripts/miscellaneous/run.m, scripts/miscellaneous/swapbytes.m, scripts/miscellaneous/tar.m, scripts/miscellaneous/tmpnam.m, scripts/miscellaneous/unpack.m, scripts/miscellaneous/what.m, scripts/sparse/bicg.m, scripts/sparse/bicgstab.m, scripts/sparse/cgs.m, scripts/sparse/colperm.m, scripts/sparse/eigs.m, scripts/sparse/etreeplot.m, scripts/sparse/gmres.m, scripts/sparse/gplot.m, scripts/sparse/ichol.m, scripts/sparse/ilu.m, scripts/sparse/pcg.m, scripts/sparse/pcr.m, scripts/sparse/qmr.m, scripts/sparse/spaugment.m, scripts/sparse/spconvert.m, scripts/sparse/spdiags.m, scripts/sparse/spfun.m, scripts/sparse/spones.m, scripts/sparse/sprandsym.m, scripts/sparse/spstats.m, scripts/sparse/spy.m, scripts/sparse/svds.m, scripts/sparse/treelayout.m, scripts/sparse/treeplot.m, scripts/strings/base2dec.m, scripts/strings/bin2dec.m, scripts/strings/blanks.m, scripts/strings/cstrcat.m, scripts/strings/deblank.m, scripts/strings/dec2base.m, scripts/strings/dec2bin.m, scripts/strings/dec2hex.m, scripts/strings/findstr.m, scripts/strings/hex2dec.m, scripts/strings/index.m, scripts/strings/isletter.m, scripts/strings/isstrprop.m, scripts/strings/mat2str.m, scripts/strings/ostrsplit.m, scripts/strings/regexptranslate.m, scripts/strings/rindex.m, scripts/strings/str2num.m, scripts/strings/strcat.m, scripts/strings/strchr.m, scripts/strings/strjoin.m, scripts/strings/strjust.m, scripts/strings/strmatch.m, scripts/strings/strsplit.m, scripts/strings/strtok.m, scripts/strings/strtrim.m, scripts/strings/strtrunc.m, scripts/strings/substr.m, scripts/strings/untabify.m, scripts/time/datenum.m: Update more docstrings to have one sentence summary as first line.

--- a/scripts/miscellaneous/computer.m	Sun May 03 21:52:42 2015 -0700
+++ b/scripts/miscellaneous/computer.m	Mon May 04 14:22:02 2015 -0700
@@ -22,8 +22,8 @@
 ## @deftypefnx {Function File} {[@var{c}, @var{maxsize}] =} computer ()
 ## @deftypefnx {Function File} {[@var{c}, @var{maxsize}, @var{endian}] =} computer ()
 ## @deftypefnx {Function File} {@var{arch} =} computer ("arch")
-## Print or return a string of the form @var{cpu}-@var{vendor}-@var{os}
-## that identifies the type of computer that Octave is running on.
+## Print or return a string of the form @var{cpu}-@var{vendor}-@var{os} that
+## identifies the type of computer that Octave is running on.
 ##
 ## If invoked with an output argument, the value is returned instead of
 ## printed.  For example:
@@ -38,13 +38,13 @@
 ## @end group
 ## @end example
 ##
-## If two output arguments are requested, also return the maximum number
-## of elements for an array.  This will depend on whether Octave has been
+## If two output arguments are requested, also return the maximum number of
+## elements for an array.  This will depend on whether Octave has been
 ## compiled with 32-bit or 64-bit index vectors.
 ##
-## If three output arguments are requested, also return the byte order
-## of the current system as a character (@qcode{"B"} for big-endian or
-## @qcode{"L"} for little-endian).
+## If three output arguments are requested, also return the byte order of the
+## current system as a character (@qcode{"B"} for big-endian or @qcode{"L"}
+## for little-endian).
 ##
 ## If the argument @qcode{"arch"} is specified, return a string indicating the
 ## architecture of the computer on which Octave is running.