docs: improve testifylint description of require-f-funcs flag (#5131)

Co-authored-by: Fernandez Ludovic <ldez@users.noreply.github.com>

Author: Antonboom

.golangci.next.reference.yml

@@ -3383,7 +3383,12 @@ linters-settings:
       # To enable go vet's printf checks.
       # Default: true
       check-format-string: false
-      # To require f-assertions if format string is used.
+      # To require f-assertions (e.g. `assert.Equalf`) if format string is used, even if there are no variable-length
+      # variables, i.e. it requires `require.NoErrorf` for both these cases:
+      # - require.NoErrorf(t, err, "unexpected error")
+      # - require.NoErrorf(t, err, "unexpected error for sid: %v", sid)
+      # To understand this behavior, please read the
+      # https://github.com/Antonboom/testifylint?tab=readme-ov-file#historical-reference-of-formatter.
       # Default: false
       require-f-funcs: true
     go-require:

.golangci.reference.yml

@@ -3383,7 +3383,12 @@ linters-settings:
       # To enable go vet's printf checks.
       # Default: true
       check-format-string: false
-      # To require f-assertions if format string is used.
+      # To require f-assertions (e.g. `assert.Equalf`) if format string is used, even if there are no variable-length
+      # variables, i.e. it requires `require.NoErrorf` for both these cases:
+      # - require.NoErrorf(t, err, "unexpected error")
+      # - require.NoErrorf(t, err, "unexpected error for sid: %v", sid)
+      # To understand this behavior, please read the
+      # https://github.com/Antonboom/testifylint?tab=readme-ov-file#historical-reference-of-formatter.
       # Default: false
       require-f-funcs: true
     go-require:

jsonschema/golangci.jsonschema.json

@@ -3059,7 +3059,7 @@
                   "default": true
                 },
                 "require-f-funcs": {
-                  "description": "To require f-assertions if format string is used.",
+                  "description": "To require f-assertions (e.g. assert.Equalf) if format string is used, even if there are no variable-length variables.",
                   "type": "boolean",
                   "default": false
                 }

jsonschema/golangci.next.jsonschema.json

@@ -3059,7 +3059,7 @@
                   "default": true
                 },
                 "require-f-funcs": {
-                  "description": "To require f-assertions if format string is used.",
+                  "description": "To require f-assertions (e.g. assert.Equalf) if format string is used, even if there are no variable-length variables.",
                   "type": "boolean",
                   "default": false
                 }