Fix spellings

Author: sidharthv96

cypress/integration/rendering/flowchart-v2.spec.js

@@ -674,10 +674,10 @@ A --> B
       { titleTopMargin: 0 }
     );
   });
-  it('3192: It should be possieble to render flowcharts with invisisble edges', () => {
+  it('3192: It should be possieble to render flowcharts with invisible edges', () => {
     imgSnapshotTest(
       `---
-title: Simple flowchart with invisisble edges
+title: Simple flowchart with invisible edges
 ---
 flowchart TD
 A ~~~ B

docs/syntax/flowchart.md

@@ -391,9 +391,9 @@ flowchart LR
    A == text ==> B
 ```
 
-### An invisisble link
+### An invisible link
 
-This can be a usefull tool in some instances where you want to alter the default positining of a node.
+This can be a useful tool in some instances where you want to alter the default positioning of a node.
 
 ```mermaid-example
 flowchart LR

packages/mermaid/src/docs/syntax/flowchart.md

@@ -247,7 +247,7 @@ flowchart LR
 
 ### An invisible link
 
-This can be a useful tool in some instances where you want to alter the default positining of a node.
+This can be a useful tool in some instances where you want to alter the default positioning of a node.
 
 ```mermaid-example
 flowchart LR