[TUTORIALS] Fixed minor typo in tutorial on low memory dropout (triton-lang#2850)

Author: aflah02

python/tutorials/04-low-memory-dropout.py

@@ -163,7 +163,7 @@ def seeded_dropout(x, p, seed):
 #
 # 1. Extend the kernel to operate over a matrix and use a vector of seeds - one per row.
 # 2. Add support for striding.
-# 3. (challenge) Implement a kernel for sparse Johnson-Lindenstrauss transform which generates the projection matrix one the fly each time using a seed.
+# 3. (challenge) Implement a kernel for sparse Johnson-Lindenstrauss transform which generates the projection matrix on the fly each time using a seed.
 
 # %%
 # References