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/eigs.m	Sun May 03 21:52:42 2015 -0700
+++ b/scripts/sparse/eigs.m	Mon May 04 14:22:02 2015 -0700
@@ -38,8 +38,10 @@
 ## @deftypefnx {Function File} {[@var{V}, @var{d}, @var{flag}] =} eigs (@var{A}, @dots{})
 ## @deftypefnx {Function File} {[@var{V}, @var{d}, @var{flag}] =} eigs (@var{af}, @var{n}, @dots{})
 ## Calculate a limited number of eigenvalues and eigenvectors of @var{A},
-## based on a selection criteria.  The number of eigenvalues and eigenvectors to
-## calculate is given by @var{k} and defaults to 6.
+## based on a selection criteria.
+##
+## The number of eigenvalues and eigenvectors to calculate is given by
+## @var{k} and defaults to 6.
 ##
 ## By default, @code{eigs} solve the equation
 ## @tex
@@ -147,13 +149,13 @@
 ##
 ## It is also possible to represent @var{A} by a function denoted @var{af}.
 ## @var{af} must be followed by a scalar argument @var{n} defining the length
-## of the vector argument accepted by @var{af}.  @var{af} can be
-## a function handle, an inline function, or a string.  When @var{af} is a
-## string it holds the name of the function to use.
+## of the vector argument accepted by @var{af}.  @var{af} can be a function
+## handle, an inline function, or a string.  When @var{af} is a string it
+## holds the name of the function to use.
 ##
-## @var{af} is a function of the form @code{y = af (x)}
-## where the required return value of @var{af} is determined by
-## the value of @var{sigma}.  The four possible forms are
+## @var{af} is a function of the form @code{y = af (x)} where the required
+## return value of @var{af} is determined by the value of @var{sigma}.  The
+## four possible forms are
 ##
 ## @table @code
 ## @item A * x
@@ -163,8 +165,8 @@
 ## if @var{sigma} is 0 or "sm".
 ##
 ## @item (A - sigma * I) \ x
-## for the standard eigenvalue problem, where @code{I} is the identity matrix of
-## the same size as @var{A}.
+## for the standard eigenvalue problem, where @code{I} is the identity matrix
+## of the same size as @var{A}.
 ##
 ## @item (A - sigma * B) \ x
 ## for the general eigenvalue problem.