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/isstrprop.m	Sun May 03 21:52:42 2015 -0700
+++ b/scripts/strings/isstrprop.m	Mon May 04 14:22:02 2015 -0700
@@ -18,7 +18,9 @@
 
 ## -*- texinfo -*-
 ## @deftypefn {Function File} {} isstrprop (@var{str}, @var{prop})
-## Test character string properties.  For example:
+## Test character string properties.
+##
+## For example:
 ##
 ## @example
 ## @group
@@ -27,8 +29,8 @@
 ## @end group
 ## @end example
 ##
-## If @var{str} is a cell array, @code{isstrpop} is applied recursively
-## to each element of the cell array.
+## If @var{str} is a cell array, @code{isstrpop} is applied recursively to
+## each element of the cell array.
 ##
 ## Numeric arrays are converted to character strings.
 ##
@@ -56,12 +58,12 @@
 ##
 ## @item  @qcode{"space"}
 ## @itemx @qcode{"wspace"}
-## True for whitespace characters (space, formfeed, newline, carriage
-## return, tab, vertical tab).
+## True for whitespace characters (space, formfeed, newline, carriage return,
+## tab, vertical tab).
 ##
 ## @item @qcode{"punct"}
-## True for punctuation characters (printing characters except space
-## or letter or digit).
+## True for punctuation characters (printing characters except space or
+## letter or digit).
 ##
 ## @item @qcode{"cntrl"}
 ## True for control characters.