Fix typos in some files

Author: namkhanh20xx

lib/commands/completion.js

@@ -164,7 +164,7 @@ class Completion extends BaseCommand {
         return this.wrap(opts, comps)
       }
     } catch {
-      // it wasnt a valid command, so do nothing
+      // it wasn't a valid command, so do nothing
     }
   }
 

lib/commands/init.js

@@ -66,7 +66,7 @@ class Init extends BaseCommand {
       throw err
     })
 
-    // these are workspaces that are being created, so we cant use
+    // these are workspaces that are being created, so we can't use
     // this.setWorkspaces()
     const filters = this.npm.config.get('workspace')
     const wPath = filterArg => resolve(this.npm.localPrefix, filterArg)