Clarify that first ElasticApmAttacher.attach() wins

[felixbarny]

closes #795

[codecov-io]

Codecov Report

Merging #797 into master will increase coverage by 4.44%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #797      +/-   ##
============================================
+ Coverage     64.42%   68.86%   +4.44%     
- Complexity       80     2002    +1922     
============================================
  Files           218      200      -18     
  Lines          8848     8139     -709     
  Branches       1132      993     -139     
============================================
- Hits           5700     5605      -95     
+ Misses         2785     2178     -607     
+ Partials        363      356       -7

Impacted Files	Coverage Δ	Complexity Δ
.../elastic/apm/agent/bci/bytebuddy/MatcherTimer.java	62.5% <0%> (-31.25%)	4% <0%> (+4%)
...c/apm/agent/bci/MatcherTimerLifecycleListener.java	75% <0%> (-18.75%)	4% <0%> (+4%)
...java/co/elastic/apm/agent/bci/ElasticApmAgent.java	71.59% <0%> (-1.78%)	22% <0%> (+22%)
...acing/impl/ExternalSpanContextInstrumentation.java
...ntracing/impl/ElasticApmTracerInstrumentation.java
...h/src/main/java/co/elastic/apm/attach/JvmInfo.java
...java/co/elastic/apm/attach/ElasticApmAttacher.java
...gent/opentracing/impl/ApmScopeInstrumentation.java
...o/elastic/apm/attach/CachedAttachmentProvider.java
.../opentracing/impl/ScopeManagerInstrumentation.java
... and 12 more

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