Change wording

Co-authored-by: Philipp Krones <hello@philkrones.com>

clippy_lints/src/upper_case_acronyms.rs

@@ -15,7 +15,9 @@ declare_clippy_lint! {
  /// See [naming conventions](https://rust-lang.github.io/api-guidelines/naming.html#casing-conforms-to-rfc-430-c-case)
  /// for more.
  ///
- /// **Known problems:** When two acronyms are contiguous, they are interpreted as a one acronym.
+ /// **Known problems:** When two acronyms are contiguous, the lint can't tell where
+ /// the first acronym ends and the second starts, so it suggests to lowercase all of
+ /// the letters in the second acronym.
  ///
  /// **Example:**
  ///