Fixed lint issues and missing documentation

internal/config/conf_source_ftsMock.go

@@ -2,17 +2,18 @@ package config
 
 import "reflect"
 
+// JSCKSourceFTSMock is the Find a Tender mock source's configuration key.
 const JSCKSourceFTSMock string = "fts_mock"
 
+// JobSearchConfigSourceFTSMock configures fetching from a Find a Tender mock
+// server (cmd/mock-fts) at APIRoot.
 type JobSearchConfigSourceFTSMock struct {
 	JobSearchConfigSource
 	APIRoot string `cfg:"api_root"`
 }
 
-/*
- * General section functions
- * See related methods in section.go
- */
+// ---------- Section methods (see Section) ----------
+
 func (c JobSearchConfigSourceFTSMock) Map() map[string]any { return mapOf(c) }
 
 func (c JobSearchConfigSourceFTSMock) Flatten() map[string]any {