Fix case in doc_valid_idents

BibTeX and BibLaTeX use the usual capitalization of TeX tools:
- https://www.ctan.org/pkg/bibtex
- https://www.ctan.org/pkg/biblatex

Author: mcarton

clippy_lints/src/utils/conf.rs

@@ -157,7 +157,7 @@ define_Conf! {
         "OpenGL", "OpenSSH", "OpenSSL",
         "TrueType",
         "iOS", "macOS",
-        "TeX", "LaTeX", "BibTex", "BibLaTex",
+        "TeX", "LaTeX", "BibTeX", "BibLaTeX",
         "MinGW",
     ] => Vec<String>),
     /// Lint: TOO_MANY_ARGUMENTS. The maximum number of argument a function or method can have