Eliminating doxygen warnings by fixing the documentation

* Fix "end of file while inside a group" doxygen warnings.

* Fix "unknown command" doxygen warnings caused by incorrect
  argument references. Instead of `@foo`, `@a foo` is the proper
  format.

* Fix "unknown command" doxygen warnings caused by incorrect
  parameter direction specifications. Instead of `@in`, `@out`,
  and `@in-out`, `[in]`, `[out]`, and `[in,out]` are the proper
  formats.

* Wrapping special characters in quotes to avoid doxygen
  confusion. Raw pipe, semicolon, dot, backslash, etc. characters
  can drive doxygen into various misinterpretations and warnings.
  E.g.:
  ```
  End of list marker found without any preceding list items
  Found unknown command
  ```
  Putting quotes around such text snipets eliminates the errors.

* Fix the documentation of `ecma_builtin_global_object_print`. Raw
  <> and \ sequences confused doxygen in various ways (it tried to
  interpret them as XML tags and doxygen commands).

* Fix "ignoring title that does not match old title" doxygen
  warnings. At some places, the group titles were out of sync, at
  others, the group names were incorrect.

* Fix "parameters are not documented" doxygen warnings. Fixing
  various typos in the inline parameter documentations (`/*`,
  `/**`, `/** <`, and `/**>` are all considered incorrect, the
  right format is `/**<`).

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

jerry-core/parser/regexp/re-compiler.c

@@ -920,6 +920,7 @@ re_dump_bytecode (re_bytecode_ctx_t *bc_ctx_p) /**< RegExp bytecode context */
 #endif /* JERRY_ENABLE_LOG */
 
 /**
+ * @}
  * @}
  * @}
  */

jerry-core/parser/regexp/re-compiler.h

@@ -56,14 +56,14 @@ typedef enum
   RE_OP_CHAR,                                     /**< any character */
   RE_OP_SAVE_AT_START,                            /**< save at start */
   RE_OP_SAVE_AND_MATCH,                           /**< save and match */
-  RE_OP_PERIOD,                                   /**< . */
-  RE_OP_ALTERNATIVE,                              /**< | */
+  RE_OP_PERIOD,                                   /**< "." */
+  RE_OP_ALTERNATIVE,                              /**< "|" */
   RE_OP_GREEDY_ITERATOR,                          /**< greedy iterator */
   RE_OP_NON_GREEDY_ITERATOR,                      /**< non-greedy iterator */
-  RE_OP_ASSERT_START,                             /**< ^ */
-  RE_OP_ASSERT_END,                               /**< $ */
-  RE_OP_ASSERT_WORD_BOUNDARY,                     /**< \b */
-  RE_OP_ASSERT_NOT_WORD_BOUNDARY,                 /**< \B */
+  RE_OP_ASSERT_START,                             /**< "^" */
+  RE_OP_ASSERT_END,                               /**< "$" */
+  RE_OP_ASSERT_WORD_BOUNDARY,                     /**< "\b" */
+  RE_OP_ASSERT_NOT_WORD_BOUNDARY,                 /**< "\B" */
   RE_OP_LOOKAHEAD_POS,                            /**< lookahead pos */
   RE_OP_LOOKAHEAD_NEG,                            /**< lookahead neg */
   RE_OP_BACKREFERENCE,                            /**< \[0..9] */

jerry-core/parser/regexp/re-parser.h

@@ -113,6 +113,7 @@ ecma_completion_value_t
 re_parse_next_token (re_parser_ctx_t *, re_token_t *);
 
 /**
+ * @}
  * @}
  * @}
  */