Remove double space in bootstrap checks docs

This commit removes a double space in the G1GC check section of the
bootstrap check docs.

docs/reference/setup/bootstrap-checks.asciidoc

@@ -165,7 +165,7 @@ forking will not be supported with seccomp enabled.
 === G1GC check
 
 Early versions of the HotSpot JVM that shipped with JDK 8 are known to have
-issues that can lead to  index corruption when the G1GC collector is enabled.
+issues that can lead to index corruption when the G1GC collector is enabled.
 The versions impacted are those earlier than the version of HotSpot that
 shipped with JDK 8u40. The G1GC check detects these early versions of the
 HotSpot JVM.