add qldoc to RegExpCharEscape

Author: erik-krogh

java/ql/lib/semmle/code/java/regex/RegexTreeView.qll

@@ -561,6 +561,15 @@ module Impl implements RegexTreeViewSig {
     }
   }
 
+  /**
+   * A character escape in a regular expression.
+   *
+   * Example:
+   *
+   * ```
+   * \.
+   * ```
+   */
   class RegExpCharEscape = RegExpEscape;
 
   /**

python/ql/lib/semmle/python/RegexTreeView.qll

@@ -457,6 +457,15 @@ module Impl implements RegexTreeViewSig {
     override string getPrimaryQLClass() { result = "RegExpAlt" }
   }
 
+  /**
+   * A character escape in a regular expression.
+   *
+   * Example:
+   *
+   * ```
+   * \.
+   * ```
+   */
   class RegExpCharEscape = RegExpEscape;
 
   /**

ruby/ql/lib/codeql/ruby/regexp/RegExpTreeView.qll

@@ -539,6 +539,15 @@ private module Impl implements RegexTreeViewSig {
     override predicate isNullable() { this.getAChild().isNullable() }
   }
 
+  /**
+   * A character escape in a regular expression.
+   *
+   * Example:
+   *
+   * ```
+   * \.
+   * ```
+   */
   class RegExpCharEscape = RegExpEscape;
 
   /**