typo QFT demo (#1346)

Fixing a typo reported by Amintor

Author: KetpuntoG

demonstrations/tutorial_qft.metadata.json

@@ -6,7 +6,7 @@
         }
     ],
     "dateOfPublication": "2024-04-16T00:00:00+00:00",
-    "dateOfLastModification": "2024-11-18T00:00:00+00:00",
+    "dateOfLastModification": "2025-04-10T00:00:00+00:00",
     "categories": [
         "Algorithms",
         "Quantum Computing"

demonstrations/tutorial_qft.py

@@ -168,7 +168,7 @@ def circuit():
 # This value corresponds to an approximation of :math:`2^nf` where :math:`f` is the frequency and :math:`n` is the
 # number of qubits.
 # Once we know the frequency, we invert it to obtain the period :math:`T` of our state.
-# In this case, the period is :math:`T = 2^5 / 3 \sim 10.33,` close to the real value of :math:`10.`
+# In this case, the period is :math:`T = 2^5 / 3 \sim 10.66,` close to the real value of :math:`10.`
 #
 # Conclusion
 # ----------