Missing docs for dotnet-gcdump

[giggio]

Either a new page should be created, or it should be refererenced on this page.

See https://devblogs.microsoft.com/dotnet/collecting-and-analyzing-memory-dumps/
for more info.

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Document Details

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• ID: 9a269a64-0a27-27d3-a509-47b9a0d114bf
• Version Independent ID: 49ff97ff-b39a-5ae8-e4b8-81a4f8eab50c
• Content: dotnet-dump - .NET Core
• Content Source: docs/core/diagnostics/dotnet-dump.md
• Product: dotnet-core
• GitHub Login: @sdmaclea
• Microsoft Alias: stmaclea

[sdmaclea]

We need a new page. @shirhatti @josalem