Apply suggestions - Improve documentation

Co-authored-by: Vincent Neiger <[email protected]>

Author: dlesnoff

doc/source/nmod_poly.rst

@@ -231,11 +231,11 @@ Randomization
 
 .. function:: void nmod_poly_randtest(nmod_poly_t poly, flint_rand_t state, slong len)
 
-    Generates a random and sparse with increased probability polynomial with length up to ``len``.
+    Generates a random polynomial with length up to ``len``, with for each coefficient the probability of some special values increased (see :func:`n_randtest`). This function is intended for use in test code.
 
 .. function:: void nmod_poly_randtest_monic(nmod_poly_t poly, flint_rand_t state, slong len)
 
-    Generates a random and sparse with increased probability monic polynomial with length ``len``.
+    Generates a random monic polynomial with length ``len``. For each coefficient the probability of some special values is increased (see :func:`n_randtest`). This function is intended for use in test code.
 
 .. function:: void nmod_poly_randtest_trinomial(nmod_poly_t poly, flint_rand_t state, slong len)
 

doc/source/nmod_poly_mat.rst

@@ -144,7 +144,7 @@ Random matrix generation
 
 .. function:: void nmod_poly_mat_randtest(nmod_poly_mat_t mat, flint_rand_t state, slong len)
 
-    Generates a matrix of polynomials sparse with an increased probability. It is equivalent to apply ``nmod_poly_randtest`` to all entries in the matrix.
+    Generates a matrix of polynomials randomly, with special values increased for each coefficient. This is intended for use in test code and is equivalent to applying ``nmod_poly_randtest`` to all entries in the matrix.
 
 .. function:: void nmod_poly_mat_randtest_sparse(nmod_poly_mat_t A, flint_rand_t state, slong len, float density)