Fix typos in comments (#7862)

Fix two typos in comments.

Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>

Author: gromero

python/tvm/target/__init__.py

@@ -16,7 +16,7 @@
 # under the License.
 """Target description and codgen module.
 
-TVM's target string is in fomat ``<target_kind> [-option=value]...``.
+TVM's target string is in format ``<target_kind> [-option=value]...``.
 
 Note
 ----

src/runtime/registry.cc

@@ -37,7 +37,7 @@ namespace runtime {
 
 struct Registry::Manager {
   // map storing the functions.
-  // We delibrately used raw pointer
+  // We deliberately used raw pointer
   // This is because PackedFunc can contain callbacks into the host languge(python)
   // and the resource can become invalid because of indeterminstic order of destruction and forking.
   // The resources will only be recycled during program exit.