Add documentation examples for consider-using-dict-items. (#6679)

Author: mbyrnepr2

doc/data/messages/c/consider-using-dict-items/bad.py

@@ -0,0 +1,10 @@
+ORCHESTRA = {
+    "violin": "strings",
+    "oboe": "woodwind",
+    "tuba": "brass",
+    "gong": "percussion",
+}
+
+
+for instrument in ORCHESTRA:  # [consider-using-dict-items]
+    print(f"{instrument}: {ORCHESTRA[instrument]}")

doc/data/messages/c/consider-using-dict-items/good.py

@@ -0,0 +1,10 @@
+ORCHESTRA = {
+    "violin": "strings",
+    "oboe": "woodwind",
+    "tuba": "brass",
+    "gong": "percussion",
+}
+
+
+for instrument, section in ORCHESTRA.items():
+    print(f"{instrument}: {section}")