doc: Clarify object types for isX functions (bug #48088) * libinterp/corefcn/data.cc (isscalar, isvector, isrow, iscolumn, ismatrix, issquare): Change docstring to indicate the functions apply to arrays of any type. * libinterp/octave-value/ov-null-mat.cc (isnull): Replace matrix with array in docstring. * scripts/linear-algebra/isbanded.m, isdefinite.m, ishermitian.m, issymmetric.m, istril, istriu: Note in docstrings that functions return true for numeric matrices. * scripts/linear-algebra/isdiag.m: Note in docstring that function returns true for numeric matrices. Define meaning of diagonal.

--- a/scripts/linear-algebra/isbanded.m	Thu Feb 15 10:09:45 2024 -0800
+++ b/scripts/linear-algebra/isbanded.m	Thu Feb 15 21:42:27 2024 -0500
@@ -25,7 +25,7 @@
 
 ## -*- texinfo -*-
 ## @deftypefn {} {@var{tf} =} isbanded (@var{A}, @var{lower}, @var{upper})
-## Return true if @var{A} is a matrix with entries confined between
+## Return true if @var{A} is a numeric matrix with entries confined between
 ## @var{lower} diagonals below the main diagonal and @var{upper} diagonals
 ## above the main diagonal.
 ##