Remove unnecessary Symbol call [NFC] (#50916)

Author: LilithHafner

stdlib/REPL/src/docview.jl

@@ -47,7 +47,7 @@ function _helpmode(io::IO, line::AbstractString, mod::Module=Main)
     x = Meta.parse(line, raise = false, depwarn = false)
     assym = Symbol(line)
     expr =
-        if haskey(keywords, Symbol(line)) || Base.isoperator(assym) || isexpr(x, :error) ||
+        if haskey(keywords, assym) || Base.isoperator(assym) || isexpr(x, :error) ||
             isexpr(x, :invalid) || isexpr(x, :incomplete)
             # Docs for keywords must be treated separately since trying to parse a single
             # keyword such as `function` would throw a parse error due to the missing `end`.