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/sparse/gmres.m	Sun May 03 21:52:42 2015 -0700
+++ b/scripts/sparse/gmres.m	Mon May 04 14:22:02 2015 -0700
@@ -20,16 +20,15 @@
 ## @deftypefn  {Function File} {@var{x} =} gmres (@var{A}, @var{b}, @var{m}, @var{rtol}, @var{maxit}, @var{M1}, @var{M2}, @var{x0})
 ## @deftypefnx {Function File} {@var{x} =} gmres (@var{A}, @var{b}, @var{m}, @var{rtol}, @var{maxit}, @var{P})
 ## @deftypefnx {Function File} {[@var{x}, @var{flag}, @var{relres}, @var{iter}, @var{resvec}] =} gmres (@dots{})
-## Solve @code{A x = b} using the Preconditioned GMRES iterative method
-## with restart, a.k.a. PGMRES(m).
+## Solve @code{A x = b} using the Preconditioned GMRES iterative method with
+## restart, a.k.a. PGMRES(m).
 ##
 ## @itemize @minus
 ## @item @var{rtol} is the relative tolerance,
 ## if not given or set to [] the default value 1e-6 is used.
 ##
-## @item @var{maxit} is the maximum number of outer iterations,
-## if not given or set to [] the default value
-## @code{min (10, numel (b) / restart)} is used.
+## @item @var{maxit} is the maximum number of outer iterations, if not given or
+## set to [] the default value @code{min (10, numel (b) / restart)} is used.
 ##
 ## @item @var{x0} is the initial guess,
 ## if not given or set to [] the default value @code{zeros (size (b))} is used.
@@ -38,12 +37,12 @@
 ## if not given or set to [] the default value @code{numel (b)} is used.
 ## @end itemize
 ##
-## Argument @var{A} can be passed as a matrix, function handle, or
-## inline function @code{f} such that @code{f(x) = A*x}.
+## Argument @var{A} can be passed as a matrix, function handle, or inline
+## function @code{f} such that @code{f(x) = A*x}.
 ##
-## The preconditioner @var{P} is given as @code{P = M1 * M2}.
-## Both @var{M1} and @var{M2} can be passed as a matrix, function handle, or
-## inline function @code{g} such that @code{g(x) = M1\x} or @code{g(x) = M2\x}.
+## The preconditioner @var{P} is given as @code{P = M1 * M2}.  Both @var{M1}
+## and @var{M2} can be passed as a matrix, function handle, or inline function
+## @code{g} such that @code{g(x) = M1\x} or @code{g(x) = M2\x}.
 ##
 ## Besides the vector @var{x}, additional outputs are:
 ##