[lex.fcon] Remove unnecessary space (#7649)

Author: ilazaric

source/lex.tex

@@ -1683,7 +1683,7 @@
 \topline
 \lhdr{\grammarterm{floating-point-suffix}} & \rhdr{type} \\ \capsep
 none & \keyword{double} \\
-\tcode{f} or \tcode{F} & \keyword {float} \\
+\tcode{f} or \tcode{F} & \keyword{float} \\
 \tcode{l} or \tcode{L} & \keyword{long} \keyword{double} \\
 \tcode{f16} or \tcode{F16} & \tcode{std::float16_t} \\
 \tcode{f32} or \tcode{F32} & \tcode{std::float32_t} \\