address review comments

Author: fricklerhandwerk

src/libexpr/primops/fetchTree.cc

@@ -333,8 +333,7 @@ static RegisterPrimOp primop_fetchTree({
 
         - `shallow` (Bool, optional)
 
-          Allow fetching from a shallow remote repository.
-          This still performs a full clone of what is available on the remote.
+          Make a shallow clone when fetching the Git tree.
 
           Default: `false`
 
@@ -361,9 +360,7 @@ static RegisterPrimOp primop_fetchTree({
         - `revCount` (Integer, optional)
 
           Number of revisions in the history of the Git repository before the fetched commit.
-
           If set, pass through the value to the output attribute set.
-          The provided value will be checked against the one obtained from the repository, and an error is thrown if there is a mismatch.
 
           Otherwise, generated from the fetched Git tree.
 
@@ -617,8 +614,7 @@ static RegisterPrimOp primop_fetchGit({
 
       - `shallow` (default: `false`)
 
-        A Boolean parameter that specifies whether fetching from a shallow remote repository is allowed.
-        This still performs a full clone of what is available on the remote.
+        Make a shallow clone when fetching the Git tree.
 
       - `allRefs`