Updated build.proj example (build package restore)

As proposed by the Sayed Ibrahim Hashimi at
https://gist.github.com/sayedihashimi/9496514
Add missing tabs/indents to build.proj example

Missing tabs for Markdown
Add missing tabs
Update Search Syntax Docs.
Update Package-Manager-Console-PowerShell-Reference.markdown

was missing the description for -reinstall switch.
Merge pull request #188 from NuGet/anurse/updatesearchsyntax

Update Search Syntax Docs.
Adds missing "s" in example files Xml

The closing tag of the files example was missing an "s"
Merge pull request #191 from dustinchilson/master

Adds missing "s" in example files Xml for NuSpec-Reference
Typo Fixed

Line 25
`Get-Package -ListAvailale` to `Get-Package -ListAvailable`
Merge pull request #192 from kilincburak/patch-1

Typo Fixed
Create NuGetClientTestPlan
Create NuGetClientTestPlan.md
Update NuGetClientTestPlan.md
Delete NuGetClientTestPlan
Update NuGetClientTestPlan.md
Create NuGetClientTestPlan.md
Update _metadata
Delete NuGetClientTestPlan.md
Merge pull request #193 from NuGet/NuGetClientTestPlan

NuGet client test plan
Create NuGet-Client-Test-Plan.md