Fix staticcheck ST1020/ST1021 warnings

I was pretty sure we have a linter for these but apparently we did not.

> libcontainer/capabilities/capabilities.go:108:1: ST1020: comment on exported method ApplyCaps should be of the form "ApplyCaps ..." (staticcheck)
> // Apply sets all the capabilities for the current process in the config.
> ^
>
>
> types/events.go:15:1: ST1021: comment on exported type Stats should be of the form "Stats ..." (with optional leading article) (staticcheck)
> // stats is the runc specific stats structure for stability when encoding and decoding stats.
> ^

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
(cherry picked from commit 30f8acabf6)
Signed-off-by: lifubang <lifubang@acmcoder.com>

libcontainer/capabilities/capabilities.go

@@ -114,7 +114,7 @@ func (c *Caps) ApplyBoundingSet() error {
 	return c.pid.Apply(capability.BOUNDING)
 }
 
-// Apply sets all the capabilities for the current process in the config.
+// ApplyCaps sets all the capabilities for the current process in the config.
 func (c *Caps) ApplyCaps() error {
 	if c.pid == nil {
 		return nil

types/events.go

@@ -12,7 +12,7 @@ type Event struct {
 	Data interface{} `json:"data,omitempty"`
 }
 
-// stats is the runc specific stats structure for stability when encoding and decoding stats.
+// Stats is the runc specific stats structure for stability when encoding and decoding stats.
 type Stats struct {
 	CPU               Cpu                 `json:"cpu"`
 	CPUSet            CPUSet              `json:"cpuset"`