Ruby: use the rb/ prefix in all query ids

Author: nickrolfe

ruby/ql/examples/snippets/emptythen.ql

@@ -2,7 +2,7 @@
  * @name If statements with empty then branch
  * @description Finds 'if' statements where the 'then' branch is
  *              an empty block statement
- * @id ruby/examples/emptythen
+ * @id rb/examples/emptythen
  * @tags if
  *       then
  *       empty

ruby/ql/src/ide-contextual-queries/localDefinitions.ql

@@ -3,7 +3,7 @@
  * @description Generates use-definition pairs that provide the data
  *              for jump-to-definition in the code viewer.
  * @kind definitions
- * @id ruby/ide-jump-to-definition
+ * @id rb/ide-jump-to-definition
  * @tags ide-contextual-queries/local-definitions
  */
 

ruby/ql/src/ide-contextual-queries/localReferences.ql

@@ -3,7 +3,7 @@
  * @description Generates use-definition pairs that provide the data
  *              for find-references in the code viewer.
  * @kind definitions
- * @id ruby/ide-find-references
+ * @id rb/ide-find-references
  * @tags ide-contextual-queries/local-references
  */
 

ruby/ql/src/ide-contextual-queries/printAst.ql

@@ -2,7 +2,7 @@
  * @name Print AST
  * @description Produces a representation of a file's Abstract Syntax Tree.
  *              This query is used by the VS Code extension.
- * @id ruby/print-ast
+ * @id rb/print-ast
  * @kind graph
  * @tags ide-contextual-queries/print-ast
  */