correct 'Documenation' to 'Documentation' (#838)

in the documentation's window title

build/sandcastle/SSH.NET.shfbproj

@@ -27,7 +27,7 @@
     <PresentationStyle>VS2010</PresentationStyle>
     <Preliminary>False</Preliminary>
     <NamingMethod>Guid</NamingMethod>
-    <HelpTitle>SSH.NET Client Library Documenation</HelpTitle>
+    <HelpTitle>SSH.NET Client Library Documentation</HelpTitle>
     <ContentPlacement>AboveNamespaces</ContentPlacement>
     <ComponentConfigurations>
       <ComponentConfig id="Code Block Component" enabled="True">
@@ -73,4 +73,4 @@
   </PropertyGroup>
   <!-- Import the SHFB build targets -->
   <Import Project="$(SHFBROOT)\SandcastleHelpFileBuilder.targets" />
-</Project>
+</Project>