docs: fix equations

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---

Author: kgryte

lib/node_modules/@stdlib/stats/incr/mcv/README.md

@@ -58,10 +58,14 @@ The [coefficient of variation][coefficient-of-variation] (also known as **relati
 
 <!-- <equation class="equation" label="eq:coefficient_of_variation" align="center" raw="c_v = \frac{s}{\bar{x}}" alt="Equation for the coefficient of variation (CV)."> -->
 
-<div class="equation" align="center" data-raw-text="c_v = \frac{s}{\bar{x}}" data-equation="eq:coefficient_of_variation">
+```math
+c_v = \frac{s}{\bar{x}}
+```
+
+<!-- <div class="equation" align="center" data-raw-text="c_v = \frac{s}{\bar{x}}" data-equation="eq:coefficient_of_variation">
     <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@eed6b690d7c37249b04544b3f5fd36ad8eb3187f/lib/node_modules/@stdlib/stats/incr/mcv/docs/img/equation_coefficient_of_variation.svg" alt="Equation for the coefficient of variation (CV).">
     <br>
-</div>
+</div> -->
 
 <!-- </equation> -->
 

lib/node_modules/@stdlib/stats/incr/nanmcv/README.md

@@ -58,10 +58,14 @@ The [coefficient of variation][coefficient-of-variation] (also known as **relati
 
 <!-- <equation class="equation" label="eq:coefficient_of_variation" align="center" raw="c_v = \frac{s}{\bar{x}}" alt="Equation for the coefficient of variation (CV)."> -->
 
-<div class="equation" align="center" data-raw-text="c_v = \frac{s}{\bar{x}}" data-equation="eq:coefficient_of_variation">
+```math
+c_v = \frac{s}{\bar{x}}
+```
+
+<!-- <div class="equation" align="center" data-raw-text="c_v = \frac{s}{\bar{x}}" data-equation="eq:coefficient_of_variation">
     <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@eed6b690d7c37249b04544b3f5fd36ad8eb3187f/lib/node_modules/@stdlib/stats/incr/nanmcv/docs/img/equation_coefficient_of_variation.svg" alt="Equation for the coefficient of variation (CV).">
     <br>
-</div>
+</div> -->
 
 <!-- </equation> -->