doc-markdown: Allow LaTeX-related words

Add "TeX", "LaTeX", "BibTeX" and "BibLaTeX" to the default list of allowed
words.

clippy_lints/src/utils/conf.rs

@@ -175,6 +175,7 @@ fn set(&mut self, name: String, value: toml::Value) -> Result<(), Error> {
         "OpenGL",
         "TrueType",
         "iOS", "macOS",
+        "TeX", "LaTeX", "BibTex", "BibLaTex",
     ] => Vec<String>),
     /// Lint: TOO_MANY_ARGUMENTS. The maximum number of argument a function or method can have
     ("too-many-arguments-threshold", too_many_arguments_threshold, 7 => u64),