Fix spelling in qldoc.

Co-authored-by: Cornelius Riemenschneider <[email protected]>

Author: MathiasVP

cpp/ql/src/semmle/code/cpp/models/implementations/Strcrement.qll

@@ -1,5 +1,5 @@
 /**
- * Provides implementation classes modeling `strinc`, `strdec` and their variants.
+ * Provides implementation classes modeling `_strinc`, `_strdec` and their variants.
  * See `semmle.code.cpp.models.Models` for usage information.
  */