mdbx: fix minor spelling.

Change-Id: Ibab66dc18c92b0ac4fa705e10befb34e268ee1f7

src/core.c

@@ -4144,7 +4144,7 @@ int mdbx_dcmp(const MDBX_txn *txn, MDBX_dbi dbi, const MDBX_val *a,
 }
 
 /* Allocate memory for a page.
- * Re-use old malloc'd pages first for singletons, otherwise just malloc.
+ * Re-use old malloc'ed pages first for singletons, otherwise just malloc.
  * Set MDBX_TXN_ERROR on failure. */
 static MDBX_page *mdbx_page_malloc(MDBX_txn *txn, unsigned num) {
   MDBX_env *env = txn->mt_env;

src/internals.h

@@ -958,7 +958,7 @@ struct MDBX_env {
   uint16_t *me_dbflags;      /* array of flags from MDBX_db.md_flags */
   unsigned *me_dbiseqs;      /* array of dbi sequence numbers */
   atomic_txnid_t *me_oldest; /* ID of oldest reader last time we looked */
-  MDBX_page *me_dp_reserve;  /* list of malloc'd blocks for re-use */
+  MDBX_page *me_dp_reserve;  /* list of malloc'ed blocks for re-use */
   /* PNL of pages that became unused in a write txn */
   MDBX_PNL me_retired_pages;
   /* Number of freelist items that can fit in a single overflow page */