Random:NextNumber() clarifications (#920)

## Changes

<!-- Please summarize your changes. -->
math.random() explicitly mentions that exactly zero can be returned by
reading it with basic number knowledge. However, Random:NextNumber()
requires developers to know numerical range notation to determine that
NextNumber can return exactly zero.

Apply the math.random() standard to Random:NextNumber().

<!-- Please link to any applicable information (forum posts, bug
reports, etc.). -->
[Found out about this in a hard way. Would like this post to be deleted
due to me being embarassed by
it](https://devforum.roblox.com/t/random-nextnumber-should-never-return-zero/3270962)

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Author: idontyboi

content/en-us/reference/engine/datatypes/Random.yaml

@@ -55,7 +55,8 @@ methods:
     summary: |
       Returns a pseudorandom number uniformly distributed over `[0, 1]`.
     description: |
-      Returns a pseudorandom number uniformly distributed over `[0, 1]`.
+      Returns a uniform pseudorandom real number in the range of 0 to 1, 
+      inclusive.
     parameters:
     returns:
       - type: number
@@ -67,7 +68,8 @@ methods:
     summary: |
       Returns a pseudorandom number uniformly distributed over `[min, max]`.
     description: |
-      Returns a pseudorandom number uniformly distributed over `[min, max]`.
+      Returns a uniform pseudorandom real number in the range of `min` to 
+      `max`, inclusive.
     parameters:
       - name: min
         type: number