Minor typos in v8.h code documentation.

When reading through the source code (v8.h) I found some minor typos
which I wanted to report.

BUG=

Review-Url: https://codereview.chromium.org/2130513002
Cr-Commit-Position: refs/heads/master@{#37835}

include/v8.h

@@ -3589,7 +3589,7 @@ class V8_EXPORT ArrayBuffer : public Object {
   /**
    * Make this ArrayBuffer external. The pointer to underlying memory block
    * and byte length are returned as |Contents| structure. After ArrayBuffer
-   * had been etxrenalized, it does no longer owns the memory block. The caller
+   * had been externalized, it does no longer own the memory block. The caller
    * should take steps to free memory when it is no longer needed.
    *
    * The memory block is guaranteed to be allocated with |Allocator::Allocate|
@@ -3600,7 +3600,7 @@ class V8_EXPORT ArrayBuffer : public Object {
   /**
    * Get a pointer to the ArrayBuffer's underlying memory block without
    * externalizing it. If the ArrayBuffer is not externalized, this pointer
-   * will become invalid as soon as the ArrayBuffer became garbage collected.
+   * will become invalid as soon as the ArrayBuffer gets garbage collected.
    *
    * The embedder should make sure to hold a strong reference to the
    * ArrayBuffer while accessing this pointer.
@@ -3652,7 +3652,7 @@ class V8_EXPORT ArrayBufferView : public Object {
    * might incur.
    *
    * Will write at most min(|byte_length|, ByteLength) bytes starting at
-   * ByteOffset of the underling buffer to the memory starting at |dest|.
+   * ByteOffset of the underlying buffer to the memory starting at |dest|.
    * Returns the number of bytes actually written.
    */
   size_t CopyContents(void* dest, size_t byte_length);
@@ -3939,7 +3939,7 @@ class V8_EXPORT SharedArrayBuffer : public Object {
   /**
    * Make this SharedArrayBuffer external. The pointer to underlying memory
    * block and byte length are returned as |Contents| structure. After
-   * SharedArrayBuffer had been etxrenalized, it does no longer owns the memory
+   * SharedArrayBuffer had been externalized, it does no longer own the memory
    * block. The caller should take steps to free memory when it is no longer
    * needed.
    *
@@ -4402,7 +4402,7 @@ typedef bool (*AccessCheckCallback)(Local<Context> accessing_context,
  * preferred.
  *
  * Any modification of a FunctionTemplate after first instantiation will trigger
- *a crash.
+ * a crash.
  *
  * A FunctionTemplate can have properties, these properties are added to the
  * function object when it is created.
@@ -7259,7 +7259,7 @@ class V8_EXPORT Context {
 
   /**
    * Gets a 2-byte-aligned native pointer from the embedder data with the given
-   * index, which must have bees set by a previous call to
+   * index, which must have been set by a previous call to
    * SetAlignedPointerInEmbedderData with the same index. Note that index 0
    * currently has a special meaning for Chrome's debugger.
    */
@@ -7339,7 +7339,7 @@ class V8_EXPORT Context {
  * It is up to the user of V8 to ensure, perhaps with locking, that this
  * constraint is not violated. In addition to any other synchronization
  * mechanism that may be used, the v8::Locker and v8::Unlocker classes must be
- * used to signal thead switches to V8.
+ * used to signal thread switches to V8.
  *
  * v8::Locker is a scoped lock object. While it's active, i.e. between its
  * construction and destruction, the current thread is allowed to use the locked