mempool: Improve comments for [GS]etLoadTried

Also change the param name for SetLoadTried to load_tried.

src/txmempool.cpp

@@ -1216,8 +1216,8 @@ bool CTxMemPool::GetLoadTried() const
     return m_load_tried;
 }
 
-void CTxMemPool::SetLoadTried(bool loaded)
+void CTxMemPool::SetLoadTried(bool load_tried)
 {
     LOCK(cs);
-    m_load_tried = loaded;
+    m_load_tried = load_tried;
 }

src/txmempool.h

@@ -728,11 +728,17 @@ public:
      */
     void GetTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants, size_t* ancestorsize = nullptr, CAmount* ancestorfees = nullptr) const;
 
-    /** @returns true if the mempool is fully loaded */
+    /**
+     * @returns true if we've made an attempt to load the mempool regardless of
+     *          whether the attempt was successful or not
+     */
     bool GetLoadTried() const;
 
-    /** Sets the current loaded state */
+    /**
-    void SetLoadTried(bool loaded);
+     * Set whether or not we've made an attempt to load the mempool (regardless
+     * of whether the attempt was successful or not)
+     */
+    void SetLoadTried(bool load_tried);
 
     unsigned long size() const
     {