Fixed a couple of typos and removed unnecessary bracket (pytorch#4345)

* Fixed a couple of typos and removed unnecessary bracket

* Fixed clang error

torchvision/csrc/io/image/cpu/encode_jpeg.cpp

@@ -14,12 +14,12 @@ torch::Tensor encode_jpeg(const torch::Tensor& data, int64_t quality) {
 
 #else
 // For libjpeg version <= 9b, the out_size parameter in jpeg_mem_dest() is
-// defined as unsigned long, where as in later version, it is defined as size_t.
+// defined as unsigned long, whereas in later version, it is defined as size_t.
 // For windows backward compatibility, we define JpegSizeType as different types
-// according to the libjpeg version used, in order to prevent compilcation
+// according to the libjpeg version used, in order to prevent compilation
 // errors.
 #if defined(_WIN32) || !defined(JPEG_LIB_VERSION_MAJOR) || \
-    (JPEG_LIB_VERSION_MAJOR < 9) ||                        \
+    JPEG_LIB_VERSION_MAJOR < 9 ||                          \
     (JPEG_LIB_VERSION_MAJOR == 9 && JPEG_LIB_VERSION_MINOR <= 2)
 using JpegSizeType = unsigned long;
 #else