Some trait cleanup for Sphere S169 (#1799)

Author: prabau

spaces/S000169/properties/P000016.md

@@ -4,4 +4,4 @@ property: P000016
 value: true
 ---
 
-This space is a closed and bounded subspace of the Euclidean space $\mathbb{R}^3$.
+This space is a closed and bounded subspace of the Euclidean space $\mathbb{R}^3$.

spaces/S000169/properties/P000086.md

@@ -6,4 +6,5 @@ refs:
 - zb: "1044.55001"
   name: Algebraic Topology (Hatcher)
 ---
+
 This is a consequence of Corollary 2.14 and the statement after Corollary 2.11 of {{zb:1044.55001}}.

spaces/S000169/properties/P000137.md

@@ -14,4 +14,4 @@ The circle can be given a CW complex structure by associating one $0$-cell and o
 
 Equivalently, this follows from the fact that CW complexes are preserved under suspensions, and since the sphere is a suspension of {S170}, which is a CW complex {S170|P240}.
 
-See Example 0.3 in {{zb:1044.55001}}.
+See Example 0.3 in {{zb:1044.55001}}.

spaces/S000169/properties/P000199.md

@@ -9,4 +9,4 @@ refs:
 
 The circle can be given a CW complex structure by associating one $0$-cell and one $1$-cell: Start with $X_0=\{*\}$, then attach a $1$-cell $D^1 = [-1,1]$ by identifying both boundary points with the $0$-cell (define $f_1: \partial D^1 \to X_0$ by $f_1(\pm 1) = *$.)
 
-See Example 0.3 in {{zb:1044.55001}}.
+See Example 0.3 in {{zb:1044.55001}}.