Fix minor typos in code comments (#9917)

src/System.Management.Automation/engine/hostifaces/History.cs

@@ -1816,7 +1816,7 @@ namespace Microsoft.PowerShell.Commands
                     );
                 }
                 else
-                {// if id,count adn newest parameters are present
+                {// if id,count and newest parameters are present
                     // throw an exception for invalid count values
 
                     long id = _id[0];

tools/releaseTools.psm1

@@ -159,7 +159,7 @@ function Get-ChangeLog
         ## and eventually merge the release branch back to the master branch. This will result in different commit nodes
         ## in master branch that actually represent same set of changes.
         ##
-        ## In this case, we cannot simply use the revision range "$tag_hash..HEAD" becuase it will include the original
+        ## In this case, we cannot simply use the revision range "$tag_hash..HEAD" because it will include the original
         ## commits in the master branch that were cherry-picked to the release branch -- they are reachable from 'HEAD'
         ## but not reachable from the last release tag. Instead, we need to exclude the commits that were cherry-picked,
         ## and only include the commits that are not in the last release into the change log.