Make equation slightly larger. [ci skip]

Author: wviechtb

README.md

@@ -31,7 +31,7 @@ Care must be taken when using the less-than and greater-than symbols in equation
 
 Curly braces/brackets in equations also cause problems. Using `\lbrace` and `\rbrace` (possibly in combination with `\left` and `\right` to make them sufficiently large) is a solution (e.g., `\mjeqn{\left\lbrace ... \right\rbrace}{\{...\}}` should render nicely in the PDF/HTML help pages and the plain-text version).
 
-Using the percent symbol (i.e., %) inside of equations is also problematic. The percent symbol needs to be 'escaped' by using a backslash, but backslashes need to be escaped as well. For this to work, we need to use the correct number of backslashes, which works slightly differently for producing the PDF, HTML, and plain-text help pages. The equation `\mjteqn{100\\\%}{100\\\\\\\%}{100\\%}` should be rendered correctly in all three help pages.
+Using the percent symbol (i.e., %) inside of equations is also problematic. The percent symbol needs to be 'escaped' by using a backslash, but backslashes need to be escaped as well. For this to work, we need to use the correct number of backslashes, which works slightly differently when producing the PDF, HTML, and plain-text help pages. The equation `\mjteqn{100\\\%}{100\\\\\\\%}{100\\%}` should be rendered correctly in all three help pages.
 
 Finally, while MathJax supports a large number of LaTeX commands, only the math-mode commands are implemented. See [here](https://docs.mathjax.org/en/latest/input/tex/macros/index.html) for a list of the supported commands.
 
@@ -40,7 +40,7 @@ Finally, while MathJax supports a large number of LaTeX commands, only the math-
 The probability density function of a normal distribution is given by
 
 <p align="center">
-<img src="https://render.githubusercontent.com/render/math?math=%5Clarge%20f(x)%20%3D%20%5Cfrac%7B1%7D%7B%5Csqrt%7B2%5Cpi%7D%20%5Csigma%7D%20e%5E%7B-%5Cfrac%7B1%7D%7B2%7D%5Cleft(%5Cfrac%7Bx-%5Cmu%7D%7B%5Csigma%7D%5Cright)%5E2%7D%2C">
+<img src="https://render.githubusercontent.com/render/math?math=%5CLarge%20f(x)%20%3D%20%5Cfrac%7B1%7D%7B%5Csqrt%7B2%5Cpi%7D%20%5Csigma%7D%20e%5E%7B-%5Cfrac%7B1%7D%7B2%7D%5Cleft(%5Cfrac%7Bx-%5Cmu%7D%7B%5Csigma%7D%5Cright)%5E2%7D%2C">
 </p>
 
 where ![\mu](https://render.githubusercontent.com/render/math?math=%5Cmu) denotes the mean of the distribution and ![\sigma](https://render.githubusercontent.com/render/math?math=%5Csigma) its standard deviation.