Fix typos in gradle.properties (#2211)

diff --git a/gradle.properties b/gradle.properties
index 238a9c6..b778ce2 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -45,10 +45,10 @@
 kotlin.incremental.multiplatform=true
 kotlin.native.ignoreDisabledTargets=true
 
-# Site deneration
+# Site generation
 jekyll_version=4.0
 
-# JS IR baceknd sometimes crashes with out-of-memory
+# JS IR backend sometimes crashes with out-of-memory
 # TODO: Remove once KT-37187 is fixed
 org.gradle.jvmargs=-Xmx2g