Minor update to dataset docs to lead users to quickstart and list_dat…

…asets (#5484)

**Context:**
Users have trouble finding all `bondlength` and `basis` combinations for
qchem molecules. They end up using the slider on the website to check
which bond lengths are available one-by-one.

![image](https://github.com/PennyLaneAI/pennylane/assets/67476785/fe2686b9-8f37-4e4e-854f-bf4708e0900a)


**Description of the Change:**
- Updated the quickstart guide to say "viewing available datasets"
instead of "dataset structure"
- Updated the `qml.data` docs to encourage users to first read the
quickstart guide

**Benefits:**
Users should be more likely to reach the `list_datasets` description in
the quickstart guide and know that it can be used to view the available
datasets.

**Possible Drawbacks:**
Users who use pennylane.ai/datasets but don't go to the documentation
still won't see this.

---------

Co-authored-by: Utkarsh <utkarshazad98@gmail.com>

doc/introduction/data.rst

@@ -97,12 +97,12 @@ use them directly in a PennyLane circuits as follows:
 >>> print(circuit())
 -1.0791430411076344
 
-Dataset Structure
------------------
+Viewing Available Datasets
+--------------------------
 
-You can call the 
+We can call the 
 :func:`~pennylane.data.list_datasets` function to get a snapshot of the currently available data.
-This function returns a nested dictionary as we show below. 
+This function returns a nested dictionary as shown below. 
 
 >>> available_data = qml.data.list_datasets()
 >>> available_data.keys()
@@ -150,6 +150,9 @@ We can then write this :class:`~pennylane.data.Dataset` to storage and read it a
 >>> read_dataset.energies
 array([-1.5, -0.5,  0.5,  1.5])
 
+For more details on reading and writing custom datasets, including metadata, please
+see the :mod:`~.data` module documentation.
+
 :html:`<div class="summary-table">`
 
 Quantum Datasets Functions and Classes

doc/releases/changelog-dev.md

@@ -427,6 +427,9 @@
 * The input types for `coupling_map` in `qml.transpile` are updated to reflect all the allowed input types by `nx.to_networkx_graph`.
   [(#5864)](https://github.com/PennyLaneAI/pennylane/pull/5864)
 
+* The text in the `qml.data` module and datasets quickstart have been slightly modified to lead to the quickstart first and highlight `list_datasets`.
+  [(5484)](https://github.com/PennyLaneAI/pennylane/pull/5484)
+
 <h3>Bug fixes 🐛</h3>
 
 * Fixes a bug where `hadamard_grad` returned a wrong shape for `qml.probs()` without wires.
@@ -567,6 +570,7 @@ Isaac De Vlugt,
 Diksha Dhawan,
 Pietropaolo Frisoni,
 Emiliano Godinez,
+Diego Guala,
 Daria Van Hende,
 Austin Huang,
 David Ittah,

pennylane/data/__init__.py

@@ -15,7 +15,7 @@
 
 .. note::
 
-    For more details on using datasets, please see the
+    To start using datasets, please first see the
     :doc:`quantum datasets quickstart guide </introduction/data>`.
 
 Overview