docs: update zsh integration instructions (#3794)

README.md

@@ -204,7 +204,7 @@ Add the following line to your shell configuration file.
 * zsh
   ```sh
   # Set up fzf key bindings and fuzzy completion
-  eval "$(fzf --zsh)"
+  source <(fzf --zsh)
   ```
 * fish
   ```fish
@@ -226,7 +226,7 @@ Add the following line to your shell configuration file.
 > For example, to disable ALT-C binding:
 >
 > * bash: `FZF_ALT_C_COMMAND= eval "$(fzf --bash)"`
-> * zsh: `FZF_ALT_C_COMMAND= eval "$(fzf --zsh)"`
+> * zsh: `FZF_ALT_C_COMMAND= source <(fzf --zsh)`
 > * fish: `fzf --fish | FZF_ALT_C_COMMAND= source`
 >
 > Setting the variables after sourcing the script will have no effect.

install

@@ -265,7 +265,11 @@ fi
 EOF
 
   if [[ $auto_completion -eq 1 ]] && [[ $key_bindings -eq 1 ]]; then
-    echo "eval \"\$(fzf --$shell)\"" >> "$src"
+    if [[ "$shell" = zsh ]]; then
+      echo "source <(fzf --$shell)" >> "$src"
+    else
+      echo "eval \"\$(fzf --$shell)\"" >> "$src"
+    fi
   else
     cat >> "$src" << EOF
 # Auto-completion

man/man1/fzf.1

@@ -911,7 +911,7 @@ e.g. \fBeval "$(fzf --bash)"\fR
 .B "--zsh"
 Print script to set up Zsh shell integration
 
-e.g. \fBeval "$(fzf --zsh)"\fR
+e.g. \fBsource <(fzf --zsh)\fR
 
 .TP
 .B "--fish"