Remove outdated sentence in SourceBasedCodeCoverage.rst

https://reviews.llvm.org/rGc5b94ea265133a4a28006929643155fc8fbeafe6 allows N >= 10.
diff --git a/clang/docs/SourceBasedCodeCoverage.rst b/clang/docs/SourceBasedCodeCoverage.rst
index d1d819b..710f9e9 100644
--- a/clang/docs/SourceBasedCodeCoverage.rst
+++ b/clang/docs/SourceBasedCodeCoverage.rst
@@ -86,9 +86,8 @@
   is specified, the runtime creates a pool of N raw profiles which are used for
   on-line profile merging. The runtime takes care of selecting a raw profile
   from the pool, locking it, and updating it before the program exits.  If N is
-  not specified (i.e the pattern is "%m"), it's assumed that ``N = 1``. N must
-  be between 1 and 9. The merge pool specifier can only occur once per filename
-  pattern.
+  not specified (i.e the pattern is "%m"), it's assumed that ``N = 1``. The 
+  merge pool specifier can only occur once per filename pattern.
 
 * "%c" expands out to nothing, but enables a mode in which profile counter
   updates are continuously synced to a file. This means that if the