Mistake in P89

Co-authored-by: Patrick Rabau <70125716+prabau@users.noreply.github.com>

spaces/S000135/properties/P000089.md

@@ -7,7 +7,7 @@ refs:
   name: Counterexamples in Topology
 ---
 
-Consider the map $f:X^2\to X^2$ given by
+Consider the map $f:X\to X$ given by
 - $f((x,0))= (x+1,0)$ if $x\geq 0$
 - $f((x,y))= (1,0)$ if $y\neq 0$ or $x\leq 0$.