Fix nits in PR #298 (#301)

Author: rylev

sdk/core/src/options.rs

@@ -36,12 +36,12 @@ pub struct ClientOptions {
 
 impl ClientOptions {
     /// A mutable reference to per-call policies.
-    pub fn mut_per_call_policies(&mut self) -> &mut Vec<Arc<dyn Policy>> {
+    pub fn per_call_policies_mut(&mut self) -> &mut Vec<Arc<dyn Policy>> {
         &mut self.per_call_policies
     }
 
     /// A mutable reference to per-retry policies.
-    pub fn mut_per_retry_policies(&mut self) -> &mut Vec<Arc<dyn Policy>> {
+    pub fn per_retry_policies_mut(&mut self) -> &mut Vec<Arc<dyn Policy>> {
         &mut self.per_retry_policies
     }
 

sdk/core/src/policies/retry_policies/fixed_retry.rs

@@ -19,7 +19,7 @@ pub struct FixedRetryPolicy {
 
 impl FixedRetryPolicy {
     pub(crate) fn new(delay: Duration, max_retries: u32, max_delay: Duration) -> Self {
-        FixedRetryPolicy {
+        Self {
             delay,
             max_retries,
             max_delay,