Still fixing that text that reads circular

why an equation defined for L=W works for L \neq W?

lessons/01_phugoid/01_01_Phugoid_Theory.ipynb

@@ -1,7 +1,7 @@
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@@ -187,7 +187,7 @@
       "W = C_L S \\times\\frac{1}{2} \\rho v_t^2\n",
       "\\end{equation}$$\n",
       "\n",
-      "This is an expression for the weight that we can use also when the airplane is flying _off_ the trim condition, with a forward velocity $v$. At these other conditions, the following relation holds:\n",
+      "The weight $W$ is constant for the aircraft, but the lift at any other flight condition depends on the flight speed, $v$. We can use the expression for the weight in terms of $v_t$ to obtain the ration $L/W$ at any other flight velocity, as follows:\n",
       "\n",
       "$$\\begin{equation}\n",
       "\\frac{L}{W}= \\frac{v^2}{v_t^2}\n",