[Lucene-java Wiki] Update of "SummerOfCode2011" by MikeMcCandless

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The "SummerOfCode2011" page has been changed by MikeMcCandless.
http://wiki.apache.org/lucene-java/SummerOfCode2011?action=diff&rev1=11&rev2=12

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  Lucene employs the Vector Space Model (VSM) to rank documents, which compares unfavorably to state of the art algorithms, such as BM25. Moreover, the architecture is tailored specifically to VSM, which makes the addition of new ranking functions a non-trivial task. This project aims to bring state of the art ranking methods to Lucene and to implement a query architecture with pluggable ranking functions.
  
- [[https://issues.apache.org/jira/browse/LUCENE-2973|LUCENE-2973]], [[https://issues.apache.org/jira/browse/LUCENE-2975|LUCENE-2975]] : Enable Lucene to take advantage of low-level IO options (direct IO) and generalize it’s Directory implementation
+ [[https://issues.apache.org/jira/browse/LUCENE-2793|LUCENE-2793]], [[https://issues.apache.org/jira/browse/LUCENE-2795|LUCENE-2795]] : Enable Lucene to take advantage of low-level IO options (direct IO) and generalize it’s Directory implementation
  
  Aims to generalize the current Lucene Directory implementation by making it a !UnixDirectory. This would be done by adding IOContext to the lower level API. These are two existing Lucene tasks (LUCENE-2793 and LUCENE-2795).