resolved ToC conflicts

Some conflicts between ToC entries and the ToC file were resolved.

Author: JoramSoch

I/ToC.md

@@ -428,7 +428,7 @@ title: "Table of Contents"
    &emsp;&ensp; 3.6.1. *[Definition](/D/lognorm)* <br>
    &emsp;&ensp; 3.6.2. **[Probability density function](/P/lognorm-pdf)** <br>
    &emsp;&ensp; 3.6.3. **[Cumulative distribution function](/P/lognorm-cdf)** <br>
-   &emsp;&ensp; 3.6.4. **[Quantile Function](/P/lognorm-qf)** <br>
+   &emsp;&ensp; 3.6.4. **[Quantile function](/P/lognorm-qf)** <br>
    &emsp;&ensp; 3.6.5. **[Mean](/P/lognorm-mean)** <br>
    &emsp;&ensp; 3.6.6. **[Median](/P/lognorm-med)** <br>
    &emsp;&ensp; 3.6.7. **[Mode](/P/lognorm-mode)** <br>

P/beta-chi2.md

@@ -11,7 +11,7 @@ title: "Relationship between chi-squared distribution and beta distribution"
 chapter: "Probability Distributions"
 section: "Univariate continuous distributions"
 topic: "Beta distribution"
-theorem: "Relationship with chi-squared distribution"
+theorem: "Relationship to chi-squared distribution"
 
 sources:
   - authors: "Probability Fact"

P/mult-cov.md

@@ -11,7 +11,7 @@ title: "Covariance matrix of the multinomial distribution"
 chapter: "Probability Distributions"
 section: "Multivariate discrete distributions"
 topic: "Multinomial distribution"
-theorem: "Covariance Matrix"
+theorem: "Covariance"
 
 sources:
   - authors: "Tutz"