Remove markdown-lint-checker from Circle CI lint workflow (there are some bugs in the checker)

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

.circleci/config.yml

@@ -23,19 +23,19 @@ jobs:
           name: use markdownlint v0.5.0 to lint markdown file (https://github.com/markdownlint/markdownlint)
           command: |
             find  ./ -name  "*.md" | grep -v vendor | grep -v commandline |  grep -v .github |  grep -v swagger |  grep -v api |  xargs mdl -r ~MD010,~MD013,~MD024,~MD029,~MD033,~MD036
-      - run:
-          name: use markdown-link-check(https://github.com/tcort/markdown-link-check) to check links in markdown files
-          command: |
-            set +e
-            for name in $(find . -name \*.md | grep -v vendor | grep -v CHANGELOG); do 
-              if [ -f $name ]; then 
-                markdown-link-check -q $name; 
-                if [ $? -ne 0 ]; then
-                  code=1
-                fi
-              fi 
-            done 
-            bash -c "exit $code";
+#      - run:
+#          name: use markdown-link-check(https://github.com/tcort/markdown-link-check) to check links in markdown files
+#          command: |
+#            set +e
+#            for name in $(find . -name \*.md | grep -v vendor | grep -v CHANGELOG); do
+#              if [ -f $name ]; then
+#                markdown-link-check -q $name;
+#                if [ $? -ne 0 ]; then
+#                  code=1
+#                fi
+#              fi
+#            done
+#            bash -c "exit $code";
       - run:
           name: use opensource tool client9/misspell to correct commonly misspelled English words 
           command: |