(chore): small doc improvements

[ilan-gold]

Description

Summary of changes

• Add Gaussian Quadrature to the table of integration methods
• Fix small docstring reference to Simpson's rule in Gaussian base class
• Clarify reference to integrand in JIT section
• Clarify support for vectorized integrands

Resolved Issues

• For the release: develop -> release for Release 0.4.0 #175

Related Pull Requests

• develop -> release for Release 0.4.0 #175

[ilan-gold]

Wait, I want to clarify where we support multi-dim integrands.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
boole_test.py	52	4	92%	128–131
gauss_test.py	66	4	94%	157–160
gradient_test.py	97	4	96%	109, 278–280
helper_functions.py	44	1	98%	314
integration_grid_test.py	69	4	94%	156–159
integration_test_functions.py	91	2	98%	50, 137
integrator_types_test.py	57	7	88%	114–120
monte_carlo_test.py	66	4	94%	162–165
rng_test.py	38	8	79%	64–71
simpson_test.py	65	4	94%	159–162
trapezoid_test.py	66	4	94%	156–159
utils_integration_test.py	107	8	93%	38–39, 200–206
vegas_map_test.py	73	5	93%	18, 155–158
vegas_stratification_test.py	50	4	92%	93–96
vegas_test.py	102	13	87%	227–241
torchquad
__init__.py	23	23	0%	1–50
torchquad/integration
base_integrator.py	49	7	86%	28, 68–71, 75, 108, 112, 117
boole.py	30	3	90%	54, 75–79
gaussian.py	52	3	94%	83, 109, 127
grid_integrator.py	108	7	94%	40, 160, 247–248, 250–251, 278
integration_grid.py	46	4	91%	47–48, 110, 113
monte_carlo.py	97	4	96%	100, 221–222, 244
rng.py	62	24	61%	72–75, 92–120, 140
simpson.py	29	3	90%	52, 71–75
utils.py	100	8	92%	100, 139, 170, 174, 181, 193, 195, 210
vegas.py	161	4	98%	96, 100–101, 189
vegas_map.py	98	6	94%	263–273
torchquad/utils
enable_cuda.py	12	6	50%	16–21
set_precision.py	24	3	88%	35–38, 68
set_up_backend.py	19	1	95%	12
TOTAL	2036	182	91%

Tests	Skipped	Failures	Errors	Time
52	0 💤	0 ❌	0 🔥	1m 56s ⏱️

[ilan-gold]

okayyyyy, ready

[gomezzz]

👍 perfect. sorry if I merged the other on too early!