fixed some typos

just fixed some typos also changed the width of the table 8.1 (just so there is more space for the definition and a little less for the number) the euro symbol wasn't displaying in the formula (in "Decision analysis") so changed it that it now shows the symbol in the book

book/pd/risk-analysis/definition.md

@@ -90,6 +90,7 @@ Substantial research has also focused on factors that determine the perception o
 :::{list-table} Formal definitions of risk used in social sciences {cite:p}`vlek1996`
 :header-rows: 1
 :name: risk_definitions
+:widths: 10 90
 
 * - No.
   - Definition