[ESQL] Update docs format (missing space before '=') (elastic#116808)

Author: GalLalouche

docs/reference/esql/functions/kibana/definition/bit_length.json

@@ -663,7 +663,7 @@ required_capability: fn_bit_length
 FROM airports
 | WHERE country == "India"
 | KEEP city
-| EVAL fn_length=LENGTH(city), fn_bit_length = BIT_LENGTH(city)
+| EVAL fn_length = LENGTH(city), fn_bit_length = BIT_LENGTH(city)
 // end::bitLength[]
 | SORT city
 | LIMIT 3

docs/reference/esql/functions/kibana/definition/byte_length.json

@@ -379,7 +379,7 @@ required_capability: fn_byte_length
 FROM airports
 | WHERE country == "India"
 | KEEP city
-| EVAL fn_length=LENGTH(city), fn_byte_length = BYTE_LENGTH(city)
+| EVAL fn_length = LENGTH(city), fn_byte_length = BYTE_LENGTH(city)
 // end::byteLength[]
 | SORT city
 | LIMIT 3