Document variable names for request.CTX and mlog.Logger (#26029)

server/public/shared/mlog/mlog.go

@@ -28,6 +28,7 @@ const (
 	DefaultMetricsUpdateFreqMillis = 15000
 )
 
+// LoggerIFace should be abbreviated as `logger`.
 type LoggerIFace interface {
 	IsLevelEnabled(Level) bool
 	Trace(string, ...Field)
@@ -169,6 +170,8 @@ func Map[M ~map[K]V, K comparable, V any](key string, val M) Field {
 // so that there are no allocations on the heap each interface method invocation. Normally not
 // something to be concerned about, but logging calls for disabled levels should have as little CPU
 // and memory impact as possible. Most of these wrapper calls will be inlined as well.
+//
+// Logger should be abbreviated as `logger`.
 type Logger struct {
 	log        *logr.Logger
 	lockConfig *int32

server/public/shared/request/context.go

@@ -12,6 +12,7 @@ import (
 	"github.com/mattermost/mattermost/server/public/shared/mlog"
 )
 
+// Context should be abbreviated as `rctx`.
 type Context struct {
 	t              i18n.TranslateFunc
 	session        model.Session
@@ -148,6 +149,7 @@ func (c *Context) With(f func(ctx CTX) CTX) CTX {
 	return f(c)
 }
 
+// CTX should be abbreviated as `rctx`.
 type CTX interface {
 	T(string, ...interface{}) string
 	GetT() i18n.TranslateFunc