update observation space docstring for fetch pick_and_place push slide environments

[SethPate]

Description

The docstring for the observations space in the Fetch Push, Slide, PickAndPlace tasks has a typo. I didn't find a similar problem in Reach. This is only a change to the docstring.

Fixes # (issue)

Type of change

• This change requires a documentation update

Screenshots

n/a

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[Kallinteris-Andreas]

1. can you run pre-commit?
2. can you point to the code that corresponds to the changed documentation (with a perma-link)
   Thanks

[SethPate]

Here's the relevant code:
https://github.com/Farama-Foundation/Gymnasium-Robotics/blob/f2754e19011a6ef329a40efc92dfa4bad81a22d3/gymnasium_robotics/envs/fetch/fetch_env.py#L205C1-L205C51

I'm seeing the same failure on pre-commit, not sure what would cause it to break.

[Kallinteris-Andreas]

Thanks, for the fixes!!!

[Kallinteris-Andreas]

I will merge as soon as I fix the CI situation

[Kallinteris-Andreas]

The perma-link provided in a previous post was for the oldmujoco-py based version, for context new version:

Gymnasium-Robotics/gymnasium_robotics/envs/fetch/fetch_env.py

Lines 314 to 338 in f2754e1

	grip_pos = self._utils.get_site_xpos(self.model, self.data, "robot0:grip")
	dt = self.n_substeps * self.model.opt.timestep
	grip_velp = (
	self._utils.get_site_xvelp(self.model, self.data, "robot0:grip") * dt
	)
	robot_qpos, robot_qvel = self._utils.robot_get_obs(
	self.model, self.data, self._model_names.joint_names
	)
	if self.has_object:
	object_pos = self._utils.get_site_xpos(self.model, self.data, "object0")
	# rotations
	object_rot = rotations.mat2euler(
	self._utils.get_site_xmat(self.model, self.data, "object0")
	)
	# velocities
	object_velp = (
	self._utils.get_site_xvelp(self.model, self.data, "object0") * dt
	)
	object_velr = (
	self._utils.get_site_xvelr(self.model, self.data, "object0") * dt
	)
	# gripper state
	object_rel_pos = object_pos - grip_pos