Fixed bold text

Author: halirutan

README.md

@@ -9,9 +9,9 @@ more than 6600 rules is the right one to apply to a given integrand.
 The rules are displayed in mathematical notation followed by the equivalent Mathematica program code.
 The following types of comments precede many of the rules
 
-- Derivation gives the integration technique used to derive a rule.
-- Basis gives the mathematical identity used to transform the integrand into a form easier to integrate.
-- Reference gives the number assigned to the rule in one or more of the following integration tables:
+- **Derivation** gives the integration technique used to derive a rule.
+- **Basis** gives the mathematical identity used to transform the integrand into a form easier to integrate.
+- **Reference** gives the number assigned to the rule in one or more of the following integration tables:
   - **G&R** is the ["Table of Integrals, Series, and Products"](https://isbnsearch.org/isbn/9780122947551),
    fifth edition, I.S. Gradshteyn, I.M. Ryzhik, and Alan Jeffrey, editors.
   - **CRC** is the ["CRC Standard Mathematical Tables and Formulae"](https://isbnsearch.org/isbn/9780849306297),

header.md

@@ -9,9 +9,9 @@ more than 6600 rules is the right one to apply to a given integrand.
 The rules are displayed in mathematical notation followed by the equivalent Mathematica program code.
 The following types of comments precede many of the rules
 
-- Derivation gives the integration technique used to derive a rule.
-- Basis gives the mathematical identity used to transform the integrand into a form easier to integrate.
-- Reference gives the number assigned to the rule in one or more of the following integration tables:
+- **Derivation** gives the integration technique used to derive a rule.
+- **Basis** gives the mathematical identity used to transform the integrand into a form easier to integrate.
+- **Reference** gives the number assigned to the rule in one or more of the following integration tables:
   - **G&R** is the ["Table of Integrals, Series, and Products"](https://isbnsearch.org/isbn/9780122947551),
    fifth edition, I.S. Gradshteyn, I.M. Ryzhik, and Alan Jeffrey, editors.
   - **CRC** is the ["CRC Standard Mathematical Tables and Formulae"](https://isbnsearch.org/isbn/9780849306297),