Fixes various installation bugs

[myurasov-nv]

Description

Fixed bugs:

• [NVBug 6122918] - Grammar in installation docs (these dependency -> these dependencies; drop redundant guides after ``:ref:`how-to```).
• [NVBug 6125106] - Add an Environment setup section to the kit-less install page so it does not jump from git clone straight to ./isaaclab.sh --install.
• [NVBug 6125054] - Relax starlette==0.49.1 -> >=0.46.0,<0.50 so isaaclab[isaacsim,all]==3.0.0 resolves alongside isaacsim==6.0.0.0 (transitively requires starlette<0.49.0).
• [NVBug 6122885] - Bump recommended driver versions on the installation index to the Beta2 POR (Linux 580.95.05, Spark 580.142, Windows 581.42.00).

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Documentation update

Checklist

• I have read and understood the contribution guidelines
• I have run the pre-commit checks with ./isaaclab.sh --format
• 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
• I have added a changelog fragment under source/<pkg>/changelog.d/ for every touched package (do not edit CHANGELOG.rst or bump extension.toml -- CI handles that)
• I have added my name to the CONTRIBUTORS.md or my name already exists there

[greptile-apps]

Greptile Summary

This PR bundles four small Beta2 acceptance-gating fixes: a grammar correction in build docs, a cross-reference cleanup in verification docs, driver version bumps to Beta2 POR, an environment-setup section added to the kit-less install page, and a relaxation of the starlette pin from ==0.49.1 to >=0.46.0,<0.50 so isaaclab[isaacsim,all]==3.0.0 can resolve alongside isaacsim==6.0.0.0.

• Driver versions in index.rst updated to Linux 580.95.05, Spark 580.142, Windows 581.42.00.
• starlette dependency relaxed in both setup.py and python_packages.toml; changelog fragment and comments are consistent.
• Kit-less install page gains a "Preparing a Python Environment" section via the shared pip_python_virtual_env.rst include, closing the gap between git clone and ./isaaclab.sh --install.

Confidence Score: 5/5

All changes are documentation updates or a narrow dependency range relaxation with a well-documented rationale; nothing touches runtime logic.

The starlette range change is clearly motivated, constrained, and kept in sync across both setup.py and python_packages.toml. Documentation changes are additive and correct. No runtime code is modified.

No files require special attention; the only minor note is that the shared pip_python_virtual_env.rst include on the kit-less page contains Isaac Sim-specific language that may briefly confuse kit-less users.

Important Files Changed

Filename	Overview
docs/source/setup/installation/kitless_installation.rst	Adds an "Environment setup" section by including pip_python_virtual_env.rst; the included file references Isaac Sim requirements which may be confusing in a kit-less context.
source/isaaclab/setup.py	Relaxes starlette pin from ==0.49.1 to >=0.46.0,<0.50 to resolve alongside isaacsim 6.0.0.0; range and comment are correct and in sync with python_packages.toml.
tools/wheel_builder/res/python_packages.toml	Starlette constraint kept in sync with setup.py; old TODO comment removed.
docs/source/setup/installation/index.rst	Driver version table updated to Beta2 POR: Linux 580.95.05, Spark 580.142, Windows 581.42.00.
source/isaaclab/changelog.d/my-nvbugs-2.rst	New changelog fragment documenting the starlette relaxation; version range matches setup.py and python_packages.toml.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Kit-less Install Page] --> B[pip_python_virtual_env.rst\nEnvironment Setup - NEW]
    B --> C[Create Python 3.12 venv\nuv / conda]
    C --> D[Clone Isaac Lab\ngit clone]
    D --> E[./isaaclab.sh --install]

    subgraph dep[Dependency Resolution]
        F[isaaclab setup.py\nstarlette >=0.46.0,<0.50]
        G[python_packages.toml\nstarlette >=0.46.0,<0.50]
        H[isaacsim-kernel\nfastapi==0.117.1 → starlette<0.49.0]
        F -- resolves with --> H
        G -- in sync with --> F
    end

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_{Reviews (3): Last reviewed commit: "Tighten starlette lower bound from 0.40 ..." | Re-trigger Greptile}

[myurasov-nv]

@greptile-apps

[myurasov-nv]

@greptile-apps