Fixes a couple broken links in documentation. (#986)

Author: MarkPflug

docs/Your-first-app-with-System-CommandLine-DragonFruit.md

@@ -59,7 +59,7 @@ The value for --bool-option is: False
 The value for --file-option is: null
 ```
 
-This program is equivalent to the one demonstrated in [Your first app with System.CommandLine](Your-first-app-with-System.CommandLine.md).
+This program is equivalent to the one demonstrated in [Your first app with System.CommandLine](Your-first-app-with-System-CommandLine.md).
 
 To explore its features, take a look at [Features: overview](Features-overview.md)
 

docs/Your-first-app-with-System-CommandLine.md

@@ -87,7 +87,7 @@ The value for --bool-option is: False
 The value for --file-option is: null
 ```
 
-This program is equivalent to the one demonstrated in [Your first app with System.CommandLine.DragonFruit](Your-first-app-with-System.CommandLine.DragonFruit.md).
+This program is equivalent to the one demonstrated in [Your first app with System.CommandLine.DragonFruit](Your-first-app-with-System-CommandLine-DragonFruit.md).
 
 To explore its features, take a look at [Features: overview](Features-overview.md)