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/fileattrib.m	Sun May 03 21:52:42 2015 -0700
+++ b/scripts/miscellaneous/fileattrib.m	Mon May 04 14:22:02 2015 -0700
@@ -20,8 +20,8 @@
 ## @deftypefn {Function File} {[@var{status}, @var{result}, @var{msgid}] =} fileattrib (@var{file})
 ## Return information about @var{file}.
 ##
-## If successful, @var{status} is 1, with @var{result} containing a
-## structure with the following fields:
+## If successful, @var{status} is 1, with @var{result} containing a structure
+## with the following fields:
 ##
 ## @table @code
 ## @item Name
@@ -42,30 +42,26 @@
 ## @item  UserRead
 ## @itemx GroupRead
 ## @itemx OtherRead
-## True if the user (group; other users) has read permission for
-## @var{file}.
+## True if the user (group; other users) has read permission for @var{file}.
 ##
 ## @item  UserWrite
 ## @itemx GroupWrite
 ## @itemx OtherWrite
-## True if the user (group; other users) has write permission for
-## @var{file}.
+## True if the user (group; other users) has write permission for @var{file}.
 ##
 ## @item  UserExecute
 ## @itemx GroupExecute
 ## @itemx OtherExecute
-## True if the user (group; other users) has execute permission for
-## @var{file}.
+## True if the user (group; other users) has execute permission for @var{file}.
 ## @end table
 ##
-## If an attribute does not apply (i.e., archive on a Unix system) then
-## the field is set to NaN.
+## If an attribute does not apply (i.e., archive on a Unix system) then the
+## field is set to NaN.
 ##
-## With no input arguments, return information about the current
-## directory.
+## With no input arguments, return information about the current directory.
 ##
-## If @var{file} contains globbing characters, return information about
-## all the matching files.
+## If @var{file} contains globbing characters, return information about all
+## the matching files.
 ## @seealso{glob}
 ## @end deftypefn