next manual error fixes

Author: mitzimorris

src/functions-reference/positive_continuous_distributions.Rmd

@@ -65,8 +65,8 @@ location mu and scale sigma
 The log of the lognormal complementary cumulative distribution
 function of y given location mu and scale sigma
 
-<!-- R; lognormal_rng; (reals mu, reals beta); -->
-\index{{\tt \bfseries lognormal\_rng }!{\tt (reals mu, reals beta): R}|hyperpage}
+<!-- R; lognormal_rng; (reals mu, reals sigma); -->
+\index{{\tt \bfseries lognormal\_rng }!{\tt (reals mu, reals sigma): R}|hyperpage}
 
 `R` **`lognormal_rng`**`(reals mu, reals sigma)`<br>\newline
 Generate a lognormal variate with location mu and scale sigma; may

src/stan-users-guide/index.Rmd

@@ -72,7 +72,7 @@ code review for pull requests.
 
 #### Acknowledgements {-}
 
-The Stan project could not exit without developers, users, and
+The Stan project could not exist without developers, users, and
 funding.  Stan is a highly collaborative project.  The individual
 contributions of the Stan developers to code is tracked through GitHub
 and to the design conversation in the Wikis and forums.