chore: fix spelling (#141)

diff --git a/Makefile b/Makefile
index 0ffb124..8965cca 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@
 IMAGE_NAME = apache/apisix
 IMAGE_TAR_NAME = apache_apisix
 
-### build-on-centos:      Build apaceh/apisix:xx-centos image
+### build-on-centos:      Build apache/apisix:xx-centos image
 build-on-centos:
 	docker build -t $(IMAGE_NAME):$(APISIX_VERSION)-centos -f ./centos/Dockerfile .
 
diff --git a/all-in-one/apisix-dashboard/Dockerfile b/all-in-one/apisix-dashboard/Dockerfile
index f15c743..a6a12b9 100644
--- a/all-in-one/apisix-dashboard/Dockerfile
+++ b/all-in-one/apisix-dashboard/Dockerfile
@@ -41,7 +41,7 @@
     && ln -s etcd-${ETCD_VERSION}-linux-amd64 etcd
 
 
-# Build APISIX Dashboard - 1. downlaod source code from github
+# Build APISIX Dashboard - 1. download source code from github
 FROM alpine:latest as pre-build
 
 ARG APISIX_DASHBOARD_VERSION