update links to lgtm.com/docs

Author: james

cpp/ql/src/semmlecode.cpp.dbscheme

@@ -233,7 +233,7 @@ svnchurn(
  * The location spans column `startcolumn` of line `startline` to
  * column `endcolumn` of line `endline` in file `file`.
  * For more information, see
- * [LGTM locations](https://lgtm.com/docs/ql/locations).
+ * [LGTM locations](https://help.semmle.com/QL/learn-ql/ql/locations.html).
  */
 locations_default(
     /** The location of an element that is not an expression or a statement. */
@@ -250,7 +250,7 @@ locations_default(
  * The location spans column `startcolumn` of line `startline` to
  * column `endcolumn` of line `endline` in file `file`.
  * For more information, see
- * [LGTM locations](https://lgtm.com/docs/ql/locations).
+ * [LGTM locations](https://help.semmle.com/QL/learn-ql/ql/locations.html).
  */
 locations_stmt(
     /** The location of a statement. */
@@ -267,7 +267,7 @@ locations_stmt(
  * The location spans column `startcolumn` of line `startline` to
  * column `endcolumn` of line `endline` in file `file`.
  * For more information, see
- * [LGTM locations](https://lgtm.com/docs/ql/locations).
+ * [LGTM locations](https://help.semmle.com/QL/learn-ql/ql/locations.html).
  */
 locations_expr(
     /** The location of an expression. */

csharp/ql/src/external/CodeDuplication.qll

@@ -6,7 +6,7 @@ private string relativePath(File file) { result = file.getRelativePath().replace
  * Holds if the `index`-th token of block `copy` is in file `file`, spanning
  * column `sc` of line `sl` to column `ec` of line `el`.
  *
- * For more information, see [LGTM locations](https://lgtm.com/docs/ql/locations).
+ * For more information, see [LGTM locations](https://help.semmle.com/QL/learn-ql/ql/locations.html).
  */
 pragma[nomagic]
 predicate tokenLocation(File file, int sl, int sc, int ec, int el, Copy copy, int index) {