refactor: delete unnecessary variable definitions and optimize the semantics of comments

Author: iSuperCoder

src/pika_list.cc

@@ -270,9 +270,8 @@ void RPopCmd::DoInitial() {
     return;
   }
   key_ = argv_[1];
-  size_t argc = argv_.size();
   size_t index = 2;
-  if (index < argc) {
+  if (index < argv_.size()) {
     if (pstd::string2int(argv_[index].data(), argv_[index].size(), &count_) == 0) {
       res_.SetRes(CmdRes::kWrongNum, kCmdNameRPop);
       return;

src/storage/include/storage/storage.h

@@ -498,10 +498,10 @@ class Storage {
   // the value stored at key is not a list.
   Status LLen(const Slice& key, uint64_t* len);
 
-  // Removes and returns the left elements of the list stored at key.
+  // Removes and returns the first elements of the list stored at key.
   Status LPop(const Slice& key, int64_t count, std::vector<std::string>* elements);
 
-  // Removes and returns the right elements of the list stored at key.
+  // Removes and returns the last elements of the list stored at key.
   Status RPop(const Slice& key, int64_t count, std::vector<std::string>* elements);
 
   // Returns the element at index index in the list stored at key. The index is