qapi/: fix some comment spelling errors

I found that there are many spelling errors in the comments of qemu,
so I used the spellcheck tool to check the spelling errors
and finally found some spelling errors in the qapi folder.

Signed-off-by: zhaolichang <zhaolichang@huawei.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200917075029.313-10-zhaolichang@huawei.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 2d94873..3c16f1e 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1795,7 +1795,7 @@
 #
 # @block-backend: corresponds to BlockBackend
 #
-# @block-job: corresonds to BlockJob
+# @block-job: corresponds to BlockJob
 #
 # @block-driver: corresponds to BlockDriverState
 #
@@ -2067,7 +2067,7 @@
 # @target: name of the destination dirty bitmap
 #
 # @bitmaps: name(s) of the source dirty bitmap(s) at @node and/or fully
-#           specifed BlockDirtyBitmap elements. The latter are supported
+#           specified BlockDirtyBitmap elements. The latter are supported
 #           since 4.1.
 #
 # Since: 4.0