fix(sec2,sec3,sec6): 时间模板行向量去掉 & 改纯逗号

bmatrix 单行行向量原同时用逗号和 &，渲染出冗余列距。&（列分隔）与逗号
（列表分隔）不并存，单行列表式向量保留逗号、删去 &。三处均为同一时间
模板 q=[s(0)e^…,…,s(T-1)e^…]^T。

parts/sec2_singleArrayDoaDoppler.tex

@@ -22,9 +22,9 @@
   \mathbf q_k(\nu_k)
   \triangleq
   \begin{bmatrix}
-    s_k(0)e^{j\nu_k\cdot0}, &
+    s_k(0)e^{j\nu_k\cdot0},
-    s_k(1)e^{j\nu_k\cdot1}, &
+    s_k(1)e^{j\nu_k\cdot1},
-    \cdots, &
+    \cdots,
     s_k(T-1)e^{j\nu_k(T-1)}
   \end{bmatrix}^\Tran
   \in\mathbb C^{T\times1}.

parts/sec3_multiSatSingleUser.tex

@@ -177,9 +177,9 @@
   \mathbf q_\ell(\boldsymbol\xi,\nu_{\mathrm{ref}})
   \triangleq
   \begin{bmatrix}
-    s(0)e^{j\nu_\ell\cdot 0}, &
+    s(0)e^{j\nu_\ell\cdot 0},
-    s(1)e^{j\nu_\ell\cdot 1}, &
+    s(1)e^{j\nu_\ell\cdot 1},
-    \cdots, &
+    \cdots,
     s(T-1)e^{j\nu_\ell(T-1)}
   \end{bmatrix}^\Tran
   \in\mathbb C^{T\times 1},

parts/sec6_multiFrameCp.tex

@@ -71,8 +71,8 @@ $\chi_\ell$ 为第 $\ell$ 颗卫星在参考时刻的\emph{公共相位}，由
   \mathbf q^{\mathrm{cp}}_{\ell,p}
   \triangleq
   \begin{bmatrix}
-    s_p(0)e^{j\phi^{\mathrm{cp}}_{\ell,p}(0)}, &
+    s_p(0)e^{j\phi^{\mathrm{cp}}_{\ell,p}(0)},
-    \cdots, &
+    \cdots,
     s_p(T-1)e^{j\phi^{\mathrm{cp}}_{\ell,p}(T-1)}
   \end{bmatrix}^\Tran,
   \qquad