rust: Fix cargo clippy and cargo doc findings

Fix the new `cargo clippy` and `cargo doc` findings that were triggered
with the recent policy addition.

Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>

rust/pvsecret/src/cmd/create.rs

@@ -141,7 +141,7 @@ fn build_asrcb(opt: &CreateSecretOpt) -> Result<AddSecretRequest> {
 // Try to extract a Config-UId from a yaml structure
 // The cuid field can be embedded in an abritray amount of Mappings
 // The function takes the first cuid it founds (width search).
-fn try_from_val(val: Value) -> anyhow::Result<ConfigUid> {
+fn try_from_val(val: Value) -> Result<ConfigUid> {
     fn get_cuid_from_mapping(val: &Value, depth: u8) -> Option<String> {
         if depth >= 8 {
             return None;