Update namespace summaries and descriptions

src/Simulation/QSharpFoundation/Random/Properties/NamespaceInfo.qs

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+/// # Summary
+/// This namespace contains functions, operations, and UDTs 
+/// for working with random values and probability distributions.
+namespace Microsoft.Quantum.Random {}

src/Simulation/TargetDefinitions/Intrinsic/Properties/NamespaceInfo.qs

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+/// # Summary
+/// This namespace contains built-in operations that represent
+/// commonly used quantum gates and measurements.
+///
+/// # Description
+/// To learn more about the operations in this namespace, see 
+/// [The Prelude](xref:microsoft.quantum.libraries.overview.standard.prelude).
+namespace Microsoft.Quantum.Intrinsic {}