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/strings/dec2base.m
+++ b/scripts/strings/dec2base.m
@@ -19,8 +19,8 @@
 ## -*- texinfo -*-
 ## @deftypefn  {Function File} {} dec2base (@var{d}, @var{base})
 ## @deftypefnx {Function File} {} dec2base (@var{d}, @var{base}, @var{len})
-## Return a string of symbols in base @var{base} corresponding to
-## the non-negative integer @var{d}.
+## Return a string of symbols in base @var{base} corresponding to the
+## non-negative integer @var{d}.
 ##
 ## @example
 ## @group
@@ -29,13 +29,13 @@
 ## @end group
 ## @end example
 ##
-## If @var{d} is a matrix or cell array, return a string matrix with one
-## row per element in @var{d}, padded with leading zeros to the width of
-## the largest value.
+## If @var{d} is a matrix or cell array, return a string matrix with one row
+## per element in @var{d}, padded with leading zeros to the width of the
+## largest value.
 ##
 ## If @var{base} is a string then the characters of @var{base} are used as
-## the symbols for the digits of @var{d}.  Space (' ') may not be used
-## as a symbol.
+## the symbols for the digits of @var{d}.  Space (' ') may not be used as a
+## symbol.
 ##
 ## @example
 ## @group
@@ -44,8 +44,8 @@
 ## @end group
 ## @end example
 ##
-## The optional third argument, @var{len}, specifies the minimum
-## number of digits in the result.
+## The optional third argument, @var{len}, specifies the minimum number of
+## digits in the result.
 ## @seealso{base2dec, dec2bin, dec2hex}
 ## @end deftypefn