Fix typo in docs and e2e tests

Signed-off-by: liamfallon <liam.fallon@est.tech>

Author: liamfallon

e2e/testdata/fn-eval/no-image-pull/.expected/exec.sh

@@ -15,11 +15,11 @@
 
 set -eo pipefail
 
-KRM_FN_RUNTIMETIME="${KRM_FN_RUNTIMETIME:=docker}"
+KRM_FN_RUNTIME="${KRM_FN_RUNTIME:=docker}"
 
 kpt fn eval --image ghcr.io/kptdev/krm-functions-catalog/search-replace:latest
 
-${KRM_FN_RUNTIMETIME} image inspect ghcr.io/kptdev/krm-functions-catalog/search-replace:latest
+${KRM_FN_RUNTIME} image inspect ghcr.io/kptdev/krm-functions-catalog/search-replace:latest
 if [[ $? != 0 ]]; then
     echo "ERR: Image could not be found locally and may not have been pulled"
     exit 1

e2e/testdata/fn-eval/no-image-pull/.expected/setup.sh

@@ -13,10 +13,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-KRM_FN_RUNTIMETIME="${KRM_FN_RUNTIMETIME:=docker}"
+KRM_FN_RUNTIME="${KRM_FN_RUNTIME:=docker}"
 
-${KRM_FN_RUNTIMETIME} image inspect ghcr.io/kptdev/krm-functions-catalog/search-replace:latest
+${KRM_FN_RUNTIME} image inspect ghcr.io/kptdev/krm-functions-catalog/search-replace:latest
 # if inspect exits with a 0 exit code the image was found locally, remove it
 if [[ $? == 0 ]]; then
-    ${KRM_FN_RUNTIMETIME} image rm ghcr.io/kptdev/krm-functions-catalog/search-replace:latest
+    ${KRM_FN_RUNTIME} image rm ghcr.io/kptdev/krm-functions-catalog/search-replace:latest
 fi