I discovered that our process for porting documentation from dotnet/runtime was incorrect. It mentioned to port from our final output, which didn't contain the source-authored docs for assemblies that didn't use /// as source of truth. This fixes that.

I tried to correct for all the problems we noticed in the first wave of changes so hopefully this is less work to correct.

• System.Buffers docs 79f056a
• System.Collections docs 818afd4
• System.ComponentModel.DataAnnotations docs fa435f0
• System.ComponentModel docs 2e99df5
• System.Composition docs 771bfa5
• System.Data docs e9bf3ba
• System.Diagnostics docs 92e84fa
• System.DirectoryServices docs 141b049
• System.Formats.Tar docs 8313f62
• System.IO.Compression docs 209deaf
• System.IO.Hashing docs 2999f7c
• System.IO.Packaging docs 04fbff6
• System.Linq docs 852d7f6
• System.Management docs a88f6f4
• System.Net docs 570af32
• System.Numerics docs 7092e78
• System.Reflection docs 22c7e8c
• System.Runtime.InteropServices docs c2f1760
• System.Runtime.Serialization docs 9325c7c
• System.Security.Claims docs be3aa11
• System.Security.Cryptography docs 09563c4
• System.Text.Json docs 1d8d650
• System.Text.RegularExpressions docs e62dfef
• System.Text docs 68b851e
• System.Threading docs f70b152
• System.Xml docs 799e0db
• System docs 64854a6