Fix some minor typos (#2625)

Signed-off-by: Vu Cong Tuan <tuanvc@vn.fujitsu.com>

.benchmark.sh

@@ -6,7 +6,7 @@ set -e +o pipefail
 return
 
 if [ "$TRAVIS_PULL_REQUEST" != "false" ] ; then
-    echo -e "NOTE: The CPU benchmarks are performed on Travis VMs and vary widly between runs," > .benchmark.body
+    echo -e "NOTE: The CPU benchmarks are performed on Travis VMs and vary wildly between runs," > .benchmark.body
     echo -e " you can't trust them. The memory benchmarks are OK\n\n" >> .benchmark.body
     awk '/^benchmark.*old/ { printf "%s\n%s\n", "```", $0 };
          /^$/ { print "```" };

coredns.1.md

@@ -16,12 +16,12 @@ bundled in CoreDNS are listed on <https://coredns.io/explugins>.
 When started with no options CoreDNS will looks for a file names `Corefile` in the current
 directory, if found it will parse its contents and start up accordingly. If no `Corefile` is found
 it will start with the *whoami* plugin (coredns-whoami(7)) and start listening on port 53 (unless
-overriden with `-dns.port`).
+overridden with `-dns.port`).
 
 Available options:
 
 **-conf** **FILE**
-: specificy Corefile to load.
+: specify Corefile to load.
 
 **-cpu** **CAP**
 : specify maximum CPU capacity in percent.