Install command typo.

Package Manager Console install command typo fixed.

Author: vhristo

docs/asciidocs/nest.asciidoc

@@ -10,7 +10,7 @@ From the Package Manager Console inside Visual Studio:
 
 [source,sh]
 ------------------------------------
-PM > Install Package NEST
+PM > Install-Package NEST
 ------------------------------------
 
 Or search for `NEST` in the Package Manager GUI.
@@ -131,4 +131,4 @@ If a response returns 200 in Elasticsearch, sometimes it will contain more infor
 
 === full documentation
 
-For the full documentation, please visit: http://nest.azurewebsites.net.
+For the full documentation, please visit: http://nest.azurewebsites.net.