doc: Periodic grammarcheck and spellcheck of documentation. * func.txi: Correct two misspellings * cumtrapz.m, dblquad.m, quadgk.m, quadl.m, quadv.m, trapz.m, triplequad.m, cond.m, gmres.m, bzip2.m, compare_versions.m, getappdata.m, unpack.m, ver.m, glpk.m, pkg.m, axis.m, uigetdir.m, uigetfile.m, view.m, prctile.m, quantile.m, unidcdf.m, unidinv.m, isstrprop.m, balance.cc, besselj.cc, cellfun.cc, colamd.cc, dot.cc, eigs.cc, fftw.cc, matrix_type.cc, pinv.cc, qr.cc, quad.cc, quadcc.cc, qz.cc, regexp.cc, schur.cc, time.cc (gmtime), typecast.cc urlwrite.cc bitfcns.cc (bitshift), data.cc (rem, norm, merge) debug.cc (dbstatus), dirfns.cc (glob), file-io.cc (freport), load-path.cc (genpath), load-save.cc (save), mappers.cc (islower, isupper, tolower, toupper) oct-hist.cc (edit_history), ov-fcn-inline.cc (vectorize), ov.cc (subsref), syscalls.cc (stat), variables.cc (whos, clear): Improve docstrings. Removed trailing whitespace characters on line.

--- a/scripts/general/quadv.m
+++ b/scripts/general/quadv.m
@@ -33,7 +33,7 @@
 ##
 ## @var{a} and @var{b} are the lower and upper limits of integration.  Both
 ## limits must be finite.
-## 
+##
 ## The optional argument @var{tol} defines the tolerance used to stop
 ## the adaptation procedure.  The default value is @math{1e^{-6}}.
 ##
@@ -52,7 +52,7 @@
 ## the number of function evaluations that were made.
 ##
 ## Note: @code{quadv} is written in Octave's scripting language and can be
-## used recursively in @code{dblquad} and @code{triplequad}, unlike the 
+## used recursively in @code{dblquad} and @code{triplequad}, unlike the
 ## similar @code{quad} function.
 ## @seealso{quad, quadl, quadgk, quadcc, trapz, dblquad, triplequad}
 ## @end deftypefn