Update API dev docs (#4017)

An action recently synced the latest dev docs. This PR updates all dev
APIs that changed.
  > [!NOTE]
  > This pull request was created by a GitHub action.

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

docs/api/qiskit-c/dev/_toc.json

@@ -5,6 +5,10 @@
       "title": "API index",
       "url": "/docs/api/qiskit-c/dev"
     },
+    {
+      "title": "Cirucit Library",
+      "url": "/docs/api/qiskit-c/dev/qk-circuit-library"
+    },
     {
       "title": "QkBitTerm",
       "url": "/docs/api/qiskit-c/dev/qk-bit-term"

docs/api/qiskit-c/dev/index.mdx

@@ -22,6 +22,10 @@ As this interface is still new in Qiskit it should be considered experimental an
 *   [QkQuantumRegister](qk-quantum-register)
 *   [QkClassicalRegister](qk-classical-register)
 
+### Circuit Library
+
+*   [Cirucit Library](qk-circuit-library)
+
 ## Quantum information
 
 *   [QkObs](qk-obs)

docs/api/qiskit-c/dev/qk-bit-term.mdx

@@ -91,7 +91,7 @@ The numeric structure of these is that they are all four-bit values of which the
 <Function id="qk_bitterm_label" signature="uint8_t qk_bitterm_label(QkBitTerm bit_term)">
   Get the label for a bit term.
 
-  <span id="group__QkBitTerm_1autotoc_md93" />
+  <span id="group__QkBitTerm_1autotoc_md144" />
 
   #### Example
 
@@ -101,11 +101,11 @@ The numeric structure of these is that they are all four-bit values of which the
   char label = qk_bitterm_label(bit_term);
   ```
 
-  <span id="group__QkBitTerm_1autotoc_md94" />
+  <span id="group__QkBitTerm_1autotoc_md145" />
 
   #### Safety
 
-  <span id="group__QkBitTerm_1autotoc_md94" />
+  <span id="group__QkBitTerm_1autotoc_md145" />
 
   The behavior is undefined if `bit_term` is not a valid `uint8_t` value of a `QkBitTerm`.
 

docs/api/qiskit-c/dev/qk-circuit-library.mdx

@@ -0,0 +1,44 @@
+---
+title: Cirucit Library (dev version)
+description: API reference for Cirucit Library in the dev version of qiskit-c
+in_page_toc_min_heading_level: 2
+python_api_type: module
+python_api_name: Cirucit Library
+---
+
+# Cirucit Library
+
+The Qiskit circuit library contains functions for building commonly used quantum circuits.
+
+## Functions
+
+### qk\_circuit\_library\_quantum\_volume
+
+<Function id="qk_circuit_library_quantum_volume" signature="QkCircuit *qk_circuit_library_quantum_volume(uint32_t num_qubits, size_t depth, int64_t seed)">
+  Generate a Quantum Volume model circuit
+
+  The model circuits are random instances of circuits used to measure the Quantum Volume metric, as introduced in \[1]. The model circuits consist of layers of Haar random elements of SU(4) applied between corresponding pairs of qubits in a random bipartition.
+
+  This function is multithreaded and will launch a thread pool with threads equal to the number of CPUs by default. You can tune the number of threads with the RAYON\_NUM\_THREADS environment variable. For example, setting RAYON\_NUM\_THREADS=4 would limit the thread pool to 4 threads.
+
+  \[1] A. Cross et al. Validating quantum computers using randomized model circuits, Phys. Rev. A 100, 032328 (2019). [arXiv:1811.12926](https://arxiv.org/abs/1811.12926)
+
+  <span id="group__QkCircuitLibrary_1autotoc_md48" />
+
+  #### Parameters
+
+  <span id="group__QkCircuitLibrary_1autotoc_md48" />
+
+  *   `num_qubits`: The number qubits to use for the generated circuit.
+  *   `depth`: The number of layers for the generated circuit.
+  *   `seed`: An RNG seed used for generating the random SU(4) matrices used in the output circuit. If the provided number is negative the seed used will be soured from system entropy.
+
+  <span id="group__QkCircuitLibrary_1autotoc_md49" />
+
+  #### Example
+
+  ```c
+  QkCircuit *qc = qk_circuit_library_quantum_volume(10, 10, -1)
+  ```
+</Function>
+

docs/api/qiskit-c/dev/qk-obs-term.mdx

@@ -66,7 +66,7 @@ This is a group of functions for interacting with an opaque (Rust-space) SparseT
 <Function id="qk_obsterm_str" signature="char *qk_obsterm_str(const QkObsTerm *term)">
   Return a string representation of the sparse term.
 
-  <span id="group__QkObsTerm_1autotoc_md91" />
+  <span id="group__QkObsTerm_1autotoc_md142" />
 
   #### Example
 
@@ -78,11 +78,11 @@ This is a group of functions for interacting with an opaque (Rust-space) SparseT
   qk_str_free(string);
   ```
 
-  <span id="group__QkObsTerm_1autotoc_md92" />
+  <span id="group__QkObsTerm_1autotoc_md143" />
 
   #### Safety
 
-  <span id="group__QkObsTerm_1autotoc_md92" />
+  <span id="group__QkObsTerm_1autotoc_md143" />
 
   Behavior is undefined `term` is not a valid, non-null pointer to a `QkObsTerm`.