Docs: remove "regular" from string definition (#5309)

docs/sources/clients/promtail/configuration.md

@@ -70,8 +70,8 @@ Where default_value is the value to use if the environment variable is undefined
 - `<filename>`: a valid path relative to current working directory or an
     absolute path.
 - `<host>`: a valid string consisting of a hostname or IP followed by an optional port number
-- `<string>`: a regular string
+- `<string>`: a string
-- `<secret>`: a regular string that is a secret, such as a password
+- `<secret>`: a string that represents a secret, such as a password
 
 ### Supported contents and default values of `config.yaml`:
 

docs/sources/configuration/_index.md

@@ -72,8 +72,8 @@ Pass the `-config.expand-env` flag at the command line to enable this way of set
 - `<labelvalue>` : a string of unicode characters
 - `<filename>` : a valid path relative to current working directory or an absolute path.
 - `<host>` : a valid string consisting of a hostname or IP followed by an optional port number
-- `<string>` : a regular string
+- `<string>` : a string
-- `<secret>` : a regular string that is a secret, such as a password
+- `<secret>` : a string that represents a secret, such as a password
 
 ### Supported contents and default values of `loki.yaml`