docs: fix incorrect union type explanation- Corrected A | B explanation from 'both at once' to 'either A or B'- Added clarification about intersection types (A & B) - Updated docs/basic/troubleshooting/types.md

Fixes #787

Author: Aditya-myst

docs/basic/troubleshooting/types.md

@@ -37,7 +37,7 @@ class App extends React.Component<
 
 [View in the TypeScript Playground](https://www.typescriptlang.org/play/?jsx=2#code/JYWwDg9gTgLgBAJQKYEMDG8BmUIjgcilQ3wFgAoCtAGxQGc64BBMMOJADxiQDsATRsnQwAdAGFckHrxgAeCnDgBvAL4AaBcs2K0EAK48YALjg89IAEZIocAD6m91agG44AejdxqwANZI4MAAWwHSaKhQAfFrkinQwKNxwALzRijr6hiZmTmHOmkT81gAUAJSpaUQwelA8cLJ8wABucBA8Yt5oPklKpclRQSEiwDxoRCAyRQCMJSoRSgN0InEJSCK6BjAqsm4NjRF5MXDhh8OjSOOGyXBFKCDGDpbWZUlRStoBwYt0SDAAyvHcIrLRIva5vQ5pODrTLXYGraHwWz2AAMZQA1HBbjB3ioSiUDooVAcVEA)
 
-**Type Guarding**: Sometimes Union Types solve a problem in one area but create another downstream. If `A` and `B` are both object types, `A | B` isn't "either A or B", it is "A or B or both at once", which causes some confusion if you expected it to be the former. Learn how to write checks, guards, and assertions (also see the Conditional Rendering section below). For example:
+**Type Guarding**: Sometimes Union Types solve a problem in one area but create another downstream. If `A` and `B` are both object types, `A | B` means "either A or B" (not both at once - that would be an intersection type `A & B`). TypeScript will only let you access properties that exist on both types unless you use type guards to narrow the type. Learn how to write checks, guards, and assertions (also see the Conditional Rendering section below). For example:
 
 ```ts
 interface Admin {