docsp-27883 - fix link (#77)

* fix link

Author: mongoKart

source/fundamentals/builders.txt

@@ -392,4 +392,4 @@ guide, see the following API Documentation:
 - `SortDefinitionBuilder <{+api-root+}/T_MongoDB_Driver_SortDefinitionBuilder_1.htm>`__
 - `UpdateDefinitionBuilder <{+api-root+}/T_MongoDB_Driver_UpdateDefinitionBuilder_1.htm>`__
 - `IndexKeysDefinitionBuilder <{+api-root+}/T_MongoDB_Driver_IndexKeysDefinitionBuilder_1.htm>`__
-- `IndexKeysDefinitionBuilder <{+api-root+}/T_MongoDB_Driver_PipelineDefinitionBuilder.htm>`__
+- `PipelineDefinitionBuilder <{+api-root+}/T_MongoDB_Driver_PipelineDefinitionBuilder.htm>`__