Merge branch 'kh/doc-fast-import-historical' into next

Doc update.

* kh/doc-fast-import-historical:
  doc: fast-import: contextualize the hardware cost

Author: gitster

Documentation/git-fast-import.adoc

@@ -182,7 +182,7 @@ amount of memory usage and processing time.  Assuming the frontend
 is able to keep up with fast-import and feed it a constant stream of data,
 import times for projects holding 10+ years of history and containing
 100,000+ individual commits are generally completed in just 1-2
-hours on quite modest (~$2,000 USD) hardware.
+hours on quite modest hardware (~$2,000 USD in 2007).
 
 Most bottlenecks appear to be in foreign source data access (the
 source just cannot extract revisions fast enough) or disk IO (fast-import