Fixed whitespace typo in Class diagram

Easier copy and pasting

docs/classDiagram.md

@@ -8,7 +8,7 @@ The class diagram is the main building block of object-oriented modeling. It is
 Mermaid can render class diagrams.
 
 ```mermaid-example
- classDiagram
+classDiagram
     Animal <|-- Duck
     Animal <|-- Fish
     Animal <|-- Zebra
@@ -29,7 +29,6 @@ Mermaid can render class diagrams.
         +bool is_wild
         +run()
     }
-
 ```
 
 ## Syntax
@@ -79,12 +78,12 @@ There are two ways to define the members of a class, and regardless of whichever
 - Associate a member of a class using **:** (colon) followed by member name, useful to define one member at a time. For example:
 
 ```mermaid-example
- classDiagram
- class BankAccount
- BankAccount : +String owner
- BankAccount : +BigDecimal balance
- BankAccount : +deposit(amount)
- BankAccount : +withdrawal(amount)
+classDiagram
+class BankAccount
+BankAccount : +String owner
+BankAccount : +BigDecimal balance
+BankAccount : +deposit(amount)
+BankAccount : +withdrawal(amount)
 ```
 
 - Associate members of a class using **{}** brackets, where members are grouped within curly brackets. Suitable for defining multiple members at once. For example: