[skip changelog] Correct library+sketch specifications re: spaces in folder name (#1194)

The previous mention of spaces as one of the characters allowed in library and sketch folder names was a copy/paste
error originating in the allowed characters in library.properties `name` properties. This specific part of the `name`
property specification doesn't apply to folder names. The reason it is allowed in the `name` property is because that
value is "sanitized" before being used by Library Manager for the library installation folder name by replacing all
spaces with underscores.

Author: per1234

docs/library-specification.md

@@ -121,7 +121,7 @@ may be added as needed to future revisions.
 #### Library Root folder
 
 The library root folder name must start with a basic letter (A-Z or a-z) or number (0-9), followed by basic letters,
-numbers, spaces ( ), underscores (\_), dots (.) and dashes (-). The maximum length is 63 characters.
+numbers, underscores (\_), dots (.) and dashes (-). The maximum length is 63 characters.
 
 #### Source code
 

docs/sketch-specification.md

@@ -11,8 +11,8 @@ Because many Arduino sketches only contain a single .ino file, it's easy to thin
 it is the folder that is the sketch. The reason is that sketches may consist of multiple code files and the folder is
 what groups those files into a single program.
 
-<!-- prettier-ignore -->
-The sketch root folder name must start with a basic letter (`A`-`Z` or `a`-`z`) or number (`0`-`9`), followed by basic letters, numbers, spaces (` `), underscores (`_`), dots (`.`) and dashes (`-`). The maximum length is 63 characters.
+The sketch root folder name must start with a basic letter (`A`-`Z` or `a`-`z`) or number (`0`-`9`), followed by basic
+letters, numbers, underscores (`_`), dots (`.`) and dashes (`-`). The maximum length is 63 characters.
 
 Support for sketch folder names starting with a number was added in Arduino IDE 1.8.4.