Add docs for yr_scanner_last_error_rule() and yr_scanner_last_error_string(). (VirusTotal#1449)

Author: wxsBSD

docs/capi.rst

@@ -895,7 +895,7 @@ Functions
 
   .. versionadded:: 3.8.0
 
-  Scan a serie of memory blocks that are provided by a :c:type:`YR_MEMORY_BLOCK_ITERATOR`.
+  Scan a series of memory blocks that are provided by a :c:type:`YR_MEMORY_BLOCK_ITERATOR`.
   The iterator has a pair of `first` and `next` functions, that must return
   the first and next blocks respectively. If the iterator returns :c:macro:`ERROR_BLOCK_NOT_READY`
   from `first` or `next`, `yr_scanner_scan_mem_blocks` also returns :c:macro:`ERROR_BLOCK_NOT_READY`,
@@ -978,6 +978,19 @@ Functions
 
     :c:macro:`ERROR_TOO_MANY_MATCHES`
 
+.. c:function:: YR_RULE* yr_scanner_last_error_rule(YR_SCANNER* scanner)
+
+  .. versionadded:: 3.8.0
+
+  Return a pointer to the ``YR_RULE`` which triggered a scanning error. In the
+  case where the rule is unable to be determined, NULL is returned.
+
+.. c:function:: YR_RULE* yr_scanner_last_error_string(YR_SCANNER* scanner)
+
+  .. versionadded:: 3.8.0
+
+  Return a pointer to the ``YR_STRING`` which triggered a scanning error.
+
 Error codes
 -----------