Add all missing docs

PkmnLib.Static/Utils/DictionaryHelpers.cs

@@ -1,12 +1,14 @@
 namespace PkmnLib.Static.Utils;
 
+/// <summary>
+/// Helpers for working with dictionaries.
+/// </summary>
 public static class DictionaryHelpers
 {
+    /// <summary>
+    /// Gets the value for a key in a dictionary, or returns a default value if the key is not found.
+    /// </summary>
     public static TValue GetOrDefault<TKey, TValue>(this IDictionary<TKey, TValue> dictionary, TKey key,
-        TValue defaultValue)
-    {
-        if (dictionary.TryGetValue(key, out var value))
-            return value;
-        return defaultValue;
-    }
+        TValue defaultValue) =>
+        dictionary.TryGetValue(key, out var value) ? value : defaultValue;
 }