Fix spellings in MemoryAllocator code (facebookincubator#10350)

Summary: Pull Request resolved: facebookincubator#10350

Reviewed By: tanjialiang

Differential Revision: D59232726

Pulled By: xiaoxmeng

fbshipit-source-id: 663ff3163460adddd5b55a46e09996cc07d4fc83

velox/common/memory/Memory.h

@@ -92,7 +92,7 @@ struct MemoryManagerOptions {
   /// std::malloc.
   bool useMmapAllocator{false};
 
-  // Number of pages in largest size class in MmapAllocator.
+  // Number of pages in the largest size class in MmapAllocator.
   int32_t largestSizeClassPages{256};
 
   /// If true, allocations larger than largest size class size will be delegated

velox/common/memory/MemoryAllocator.cpp

@@ -310,7 +310,7 @@ bool MemoryAllocator::growContiguous(
     return true;
   }
   if (reservationCB != nullptr) {
-    // May throw. If does, there is nothing to revert.
+    // May throw. If it does, there is nothing to revert.
     reservationCB(AllocationTraits::pageBytes(increment), true);
   }
   bool success = false;

velox/common/memory/MemoryAllocator.h

@@ -140,7 +140,7 @@ struct Stats {
 
 class MemoryAllocator;
 
-/// A general cache interface using 'MemroyAllocator' to allocate memory, that
+/// A general cache interface using 'MemoryAllocator' to allocate memory, that
 /// is also able to free up memory upon request by shrinking itself.
 class Cache {
  public:
@@ -173,7 +173,7 @@ class Cache {
 void setCacheFailureMessage(std::string message);
 
 /// Returns and clears a thread local message set with
-/// setCacheFailuremessage().
+/// setCacheFailureMessage().
 std::string getAndClearCacheFailureMessage();
 
 /// This class provides interface for the actual memory allocations from memory
@@ -198,7 +198,7 @@ class MemoryAllocator : public std::enable_shared_from_this<MemoryAllocator> {
     kMalloc,
     /// The memory allocator kind which is implemented by MmapAllocator. It
     /// manages the large chunk of memory allocations on its own by leveraging
-    /// mmap and madvice, to optimize the memory fragmentation in the long
+    /// mmap and madvise, to optimize the memory fragmentation in the long
     /// running service such as Prestissimo.
     kMmap,
   };