Fix indentation for nested numerated list

In case of using two spaces github doesn't treat nested list as a separate numerated list.

1 files changed, 3 insertions, 3 deletions

diff --git a/contributors/devel/instrumentation.md b/contributors/devel/instrumentation.md
index 66992e40..d54bb45a 100644
--- a/contributors/devel/instrumentation.md
+++ b/contributors/devel/instrumentation.md
@@ -28,14 +28,14 @@ The following describes the basic steps required to add a new metric (in Go).
 
 2. Create a top-level var to define the metric. For this, you have to:
 
-  1. Pick the type of metric. Use a Gauge for things you want to set to a
+    1. Pick the type of metric. Use a Gauge for things you want to set to a
 particular value, a Counter for things you want to increment, or a Histogram or
 Summary for histograms/distributions of values (typically for latency).
 Histograms are better if you're going to aggregate the values across jobs, while
 summaries are better if you just want the job to give you a useful summary of
 the values.
-  2. Give the metric a name and description.
-  3. Pick whether you want to distinguish different categories of things using
+    2. Give the metric a name and description.
+    3. Pick whether you want to distinguish different categories of things using
 labels on the metric. If so, add "Vec" to the name of the type of metric you
 want and add a slice of the label names to the definition.