Add space between words (MicrosoftDocs#2964)

reference/docs-conceptual/getting-started/fundamental/Understanding-Important-PowerShell-Concepts.md

@@ -25,7 +25,7 @@ syntax.
 
 ## The command family is extensible
 
-Interfaces such as **cmd.exe**don't provide a way for you to directly extend the built-in command
+Interfaces such as **cmd.exe** don't provide a way for you to directly extend the built-in command
 set. You can create external command-line tools that run in **cmd.exe**. But these external tools
 don't have services, such as Help integration. **cmd.exe**doesn't automatically know that these
 external tools are valid commands.
@@ -59,4 +59,4 @@ means "show me Help for this command".
 
 PowerShell is built on the .NET Framework. It shares some syntax features and keywords with the C#
 programming language. Learning PowerShell can make it much easier to learn C#. If you're already
-familiar with C#, these similarities can make learning PowerShell easier.
+familiar with C#, these similarities can make learning PowerShell easier.