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/bicgstab.m	Sun May 03 21:52:42 2015 -0700
+++ b/scripts/sparse/bicgstab.m	Mon May 04 14:22:02 2015 -0700
@@ -25,24 +25,22 @@
 ## method.
 ##
 ## @itemize @minus
-## @item @var{rtol} is the relative tolerance, if not given or set to
-## [] the default value 1e-6 is used.
+## @item @var{rtol} is the relative tolerance, if not given or set to [] the
+## default value 1e-6 is used.
 ##
-## @item @var{maxit} the maximum number of outer iterations, if not
-## given or set to [] the default value @code{min (20, numel (b))} is
-## used.
+## @item @var{maxit} the maximum number of outer iterations, if not given or
+## set to [] the default value @code{min (20, numel (b))} is used.
 ##
-## @item @var{x0} the initial guess, if not given or set to [] the
-## default value @code{zeros (size (b))} is used.
+## @item @var{x0} the initial guess, if not given or set to [] the default
+## value @code{zeros (size (b))} is used.
 ## @end itemize
 ##
-## @var{A} can be passed as a matrix or as a function handle or
-## inline function @code{f} such that @code{f(x) = A*x}.
+## @var{A} can be passed as a matrix or as a 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 or as a 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 or as a function handle or inline
+## function @code{g} such that @code{g(x) = M1 \ x} or @code{g(x) = M2 \ x}.
 ##
 ## If called with more than one output parameter
 ##