Update rust/low_wasm_memory/README.md

Co-authored-by: michael-weigelt <[email protected]>

Author: dragoljub-duric

rust/low_wasm_memory/README.md

@@ -1,6 +1,6 @@
 # Low Wasm memory hook
 
-Internet Computer can automatically execute special type of function called low Wasm memory hook, which runs when the available Wasm memory of the canister falls below 'wasm-memory-threshold'.
+The Internet Computer can automatically execute a special type of function called low Wasm memory hook, which runs when the available Wasm memory of the canister falls below the 'wasm-memory-threshold'.
 
 This example demonstrates the ways of using low Wasm memory hook on the Internet Computer.